Well, it wasn’t funny in and of itself but the first words out of my mouth made it so.
Valkyrie is driving me to the Pentagon so I can catch the Metro to work, and as we’re driving alongside the fence for Arlington National Cemetery we see a group of groundsworkers hoisting a very large bag of leaves over the fence into the cemetery.
“Ah,” says I, “the budget burial.”
People see me on the road… and I’m funny… looking.
Actually, one of my favorite things to do is ride in my dad’s right hand drive Subaru (a somewhat common car in the US) and sit on the passenger side (which is normally the driver’s side). I hang my hands out the window, drool a lot, and scream bloody murder at anyone we pass.
The looks on their faces are priceless. 
[sub]I haven’t actually done this in years.[/sub]
Funniest thing I saw was one of those bus tow trucks (you know, the ones that’re the size of a semi?) towing another truck just like it. “Holy crap,” I exclaimed, “they’re mating!”
And here I thought my hometown had the only roller Jesus. Do they franchise, do you think?
A guy drove alongside me for so long that I had to look…he had a big mirror positioned in his winsheild to afford an enlarged view of him jacking off. I was swerving and laughing and would’ve looked longer but he sped away.
I was driving down a dirt road in North Hero, VT, and there was a mannequin wearing a wig strapped to a mailbox. It was naked. I don’t know why.
Mark Serlin’s car. The license plate read “THETROLL”
An old guy near seaside heights NJ drives around a Ford Fairmont with a backseat full of papers and trash. Full. To the windows.
A dentist near my home set up a scarey halloween scene in his front yard involving an old dentist chair, one of those dentist pedestal thingys, and two dummies. One was the dentist, the other a patient, and both were wearing those “scream” masks.
The sign guy at the Loews Theater in Town Square Mall in Vestal, NY is trying to get fired. And I’m enjoying every minute of it.
The big sign at the entrance to the TSM is really getting out of hand.
First, the guy took the lettering for the movie FINAL FANTASY and tilted the I towards the F in such a way that it reads, quite deliberately, ANAL FANTASY.
One I noticed just tonight is DR DOOLITTLE 2.
But my personal favorite has got to be the new movie, PLANET O’ APES, complete with apostraphe.
Lots of odd cars around here - I think Houston may be the art car capital of the world. One of my favorites, seen many years ago, was a late ‘60s Buick Skylark, black, with the windshield replaced with steel with observation slits and a slot for a ~5" diameter x 8’ long “gun” barrel. The rear wheels had been replaced by drive tracks from a tractor and the whole tankish appearance was helped by the apparent rigging of some kind of propane setup that allowed the gun to belch flame every so often.
When I saw it the first time, a long ago fave local band (The Footnotes - wonder whatever happened to them) were set up on it (drummer on the trunk and guitar and bass half-sitting in the glassless backglass area) and playing.
Other funny stuff? I’ll have to think a bit - there’s been plenty.
I was accidentally the driver of the lead car in Houston’s Gay Pride Parade in '81 or '82, with my brother as passenger. We knew something was up, but didn’t figure out what until we managed to pull off of Westheimer Boulevard.
A guy in the Trainer, PA area has a camo van, with mock missiles on top. I used to see him occasionally.