Good one! I also like “Calm down, Burt. He probably didn’t know you were an elephant when he said that.”
Was this a Far Side?
“One look at their boots and the outlaws realized why the other gunmen were known as the *Urp * brothers.”
I liked several of the ones previously mentioned (I think we had a bag labeled “cat fud” also). One I haven’t seen mentioned yet is the one titled “Stupid Sales Clerks”. The setup:
A guy is walking out of (I think it was) “Joe’s Plenty-o-Pianos” in a trenchcoat stretched out to ridiculous proportions in the shape of a baby grand. The sales clerk runs out of the store holding up a piano stool, and saying “Sir, I think you dropped this!”
The ones were the scientists are trying to decipher what the dolphins are saying…
“Hey guys, we got another “buenos días”!”
Turns out the dolphins are speaking in Spanish to them, but the scientists do not realize that. I love that panel.
My absolute favorite.
My favorite has no caption: Two devils in hell, cracking up as they read slips of paper from a suggestion box.
I have 3 favorites – 2 with Indians, one with cows:
Circle of Indians staring down, labeled: “Custer’s Last View”
Row of Indians with the second to the last mugging and waving: “Next to the Last of the Mohicans”
Cows standing around at a backyard party. One cow is wearing a chef’s hat and apron and fipping burgers on the grill. One of the other cows says, “You’re sick, Jesse. Sick!” I had that one on a T-Shirt. Down in the corner of the shirt there was a second little drawing, with Jesse holding up a steaming burger and about to take a bite, saying “Tastes like chicken!” Breaks me up just thinking about it.
Specifically, “Assorted Rodents” and “Small, Flightless Birds”.
Gotta love the chaps on that amoeba!!
My personal favorite is of a dog sitting in front of a house on a very badly mown lawn and being berated by his owner - “You call that mowing the lawn? Bad dog, BAD DOG!! No biscuit!!”
One of those that can you can use to tell whether you’re a fan or not - Two old sailors sitting in a bar, one with a peg leg, the other with a peg head. Peg Head says “Oh yeah? Well let me tell you how I got this!” As a friend of my mother’s put it - “How can he speak, he hasn’t got a head anymore???” Some people just can’t be helped…
Grim
Oooh, I love the prehistory ones. Let’s see…
The one with early chemists describing the first “Dert” molecule. There’s a “Periodik Table” with only one element --“Dert”, chem. sym. “De” on it. Makes sense, it’s the only element they can conceive.
The “Future Werld” amusement park
Primitive waiting rooms, where the patients are reading “Cave and Tuber” and “Mammoth Illustrated”.
“Early Man”, where a modern-day Homo Sapiens woman is expecting a crowd for a dinner party and a Homo Habilis holding a nicely wrapped gift is the first to arrive.
My #1 favorite has no dialogue: The poor sad dog watching his friends terrorizing the mailman in the front yard, while he’s stuck inside practicing the violin.
Also the much-touted “CAT FUD”, and “Ginger, stay out of the garbage!”
(Why, yes, I AM fond of the dog strips.)
Also in the lineup is the angry-looking demon standing among the flames in Hell, hands on hips, in front of a doorway over which has been painted “999,” while a workman in coveralls studies a piece of paper, saying, “What the – ? I musta been holding the dang work order like this!”
The scene is in front of a suburban home. White picket fence, gate hanging on one hinge. On the sidewalk, in front of the house is mailbag laying on the ground, half on its side with letters strewn about. Several letters are also flying in the air, settling to the ground. A pair of spectacles, frames bent, one lens cracked and a postal worker’s hat are laying on the sidewalk. A dog standing upright in front of the house, bandeleros crisscrossed on his chest, bandana on his head, and an assault rifle cradled in his arms with smoke coming out the end of the barrel. Caption:
Neither rain nor sleet nor hail they said could stop the mail…but they hadn’t counted on REXBO!
A female gorilla is grooming the back of a male gorilla & finds a long blond hair in his fur:
Doing “research” with that Goodall hussy again are we?
The Goodall Institute threw a fit about it, but Jane herself loved the strip IIRC.
Actually, it’s the guy with the peg leg who says, “Oh yeah? Well let me tell you how I got this!” That’s what makes it even funnier, because the guy who lost a leg think he can still top the story of the guy who lost his freakin’ head. 
I had that one in my dorm room in college. I think the caption was something like “And it looks like Bob, our current champion, hasn’t even scored yet.”
My favorite is the one with a flock of penguins standing around like they often do when one shouts, “Bob! Staring Contest! Go!” Hell, if I had to walk 70 miles every time I was hungry I’d stand and stare a lot too.
Two demons in Hell, watching everybody toiling away - except for one guy who’s cheerfully whistling while he works. One demon says “You know, we’re just not getting through to that guy.”
Two of Larson’s famous lady cows, sitting in armchairs in a living room, with a phone ringing. One cow says “There that thing goes again - and here we sit without opposable thumbs!”
Beware of Doug.
Dog on a bulldozer, scooping away a flower bed. Caption: Ginger decides to take out Mrs. So and so’s flower bed once and for all.
Huge lizard in a trenchcoat, taking off his human face mask, talking to a woman in her living room: “I’m sorry Edna - I’m not a TV repairman who just stumbled into your life. I’m a Kimodo Dragon, largest member of the lizard family, and a filthy liar!”
Bobbing for sheep.
An airplane going down, with flames and the people in panic running around inside the plane and a poodle at the controls:
“In the midst of all the chaos, Fifi takes control.”
Something like that…
Several of my favorites:
Two mosquitos feeding on a human limb. One is ballooning rapidly, with a panicked look on its face, and the other is yelling, “Betty! Pull out! You’ve hit an artery!”
A solitary caveman standing on a hill, holding an empty bow. Trees, rocks, woolly mammoths, sabretooth tigers, and all manner of things are flying past him through the air. The caption reads: “The first cruise arrow is tested.”
Two jungle explorers are sitting at their campsite, putting their hiking boots on. One explorer turns one of the boots upside down, and a cascade of scorpions, spiders, millepedes, snakes and other hideous insects comes pouring out. The other explorer watches, his lumpy, swollen, rippling boots already on, looking as if they are about to burst. The caption reads: “With growing horror, Joe realizes he forgot to check his boots.”
I can’t remember it exactly, but a young boy runs into his house, crying. Under his arm he hold a sketch pad. His family stands around, and they all have seriously deranged faces. The caption reads “A young Pablo Picasso fails art class again.”
The viking boat being rowed by all the burly vikings… and one viking trailing his feet in the water off the back of the boat.