Wonder of wonders, some of the tshirts are the same!
http://boards.straightdope.com/sdmb/showthread.php?threadid=19305
My parents wigged when I gave my sister a T-shirt that read:
“I’m perfectly adjusted
So please don’t fiddle with the knobs.”
I was just trying to help…
Penn of Penn & Teller had one made that reproduced the Burger King logo, except the words were “Burger Christ”.
Always thought that was just the coolest.
It’s not really funny, but one of my favourite shirts says simply “I <3 Pie”.
(That picture was taken about six months ago when I was horribly drunk, so be nice and remember you’re just looking at the shirt!)
Have a nice day.
one of the guys in JHU has this cool t-shirt he made himself…
God said "
Del.B=0;
DelxE+do B/do t = 0,
Del.D = rho;
delXH-do D/do t =J"
and there was light.
http://rd11.web.cern.ch/RD11/rkb/PH14pp/img446.gif
I found that really cool.
If you are not a elec engg., you proabably think I am a nerd by now…
I used to have one that said
YOUR NAME HERE
across the chest. Pretty funny if you’ve seen all the ads for personalized items.
I have a t-shirt with an Apple Computer logo and a Windows logo…
Underneath the Apple logo: This is your brain.
Underneath the Windows logo…This is your brain on drugs…Any questions?
I had one of those tees that look like you’re wearing a black bowtie with shirt studs, vest and cummerbund.
Put that under a jeans jacket and you can go anywhere 
I have one that says “you have been naughty go to my room”
I have a friend that has one that says Team Satan 666, and one that has the little hello my name is sticker on it and it says hello my name is Satan.
He wore that once when the Mormon elders came for a visit to see why they had gotten out of the church! Too funny!
I was standing in our Gadzooks store staring up at the hooked on phonics tee-shirt and for the longest time just stared at it cause I couldn’t figure it out! Just as I was turning to walk away it struck me, and I busted out laughing in the middle of the store.
“No, but I look like him”
I was going to post this. I love it!
My husband has this one. It’s one of his favorites. I think it’s pretty cool too.
My high school’s cross country team one year had these shirts made up that said “If you can read this, then you’ve probably just been tripped, and are lying in the dirt.”
For a long time my favorite was a Negativland t-shirt that said, “Copyright infringement is your best entertainment value.” I work for a publisher, and nobody ever commented, the dolts.
I have 3:
“Fuck you you fucking fuck”
(Car reference) “Injection is nice, but I’d rather be blown”. By the way, this is great to read aloud (well, the “I’d rater be blown” part to your dinner guest, at the end of a fortune cookie 'fortune! Try it.
Black T-shirt, orange letters, “This IS my fucking Halloween outfit!”
I have one from this oyster bar in Savannah, GA that says (on the back)
Shuck me,
Suck me,
Eat me raw.
I used to have one that had a picture of a very scared looking cat, with the words "Me, Paranoid!? (Who wants to know?)
“I’m having a a bad scalp day” Worn when I dont feel like wearing a hat. 
This one made me laugh out loud and now I want one.
Another one I want is based on an old tv commercial about obeying automobile speed limits:
“186,000/mps. It’s not just a good idea. It’s the law.”
“Chaos! Panic! Disorder! My work here is done.”
A big red letter “A” with “alpha male” written under it.
A player on my school’s soccer team broke several bones his senior year and couldn’t play. The rest of the team made shirts that said “Let’s win this one for the gimp.”
My favorite t-shirt is one I wish I’d bought, and if I see it again, I will.
It’s got a picture of a nail hammered halfway into a board and it’s thinking “I’d rather be a hammer.”