CafePress can be pretty sublime. Here some products I found that might make you laugh (or at least smile appreciatively).
Schrodinger’s cat is dead” t-shirt. Everyone’s favorite thought experiment….
“Honk if you passed P-chem” bumper sticker. I’m partial to this one, since I recently passed P-chem
Alcohol and calculus don’t mix: never drink and derive t-shirt. I always thought math and beer went well together…
Carbon Dating t-shirt. Alright so this is a little cheesy…
My other car is made of dark matter bumper sticker. One of the better bumper stickers
Resistance is futile coaster. Obviously everyone needs this coaster
Ohm-m-m-m-m-m-m electrical engineering meditating bumper sticker. For some reason this made me laugh