Theories of Everything
A string theorist arrives home one evening. When he goes into his house, his wife tells him that she’s hired a private detective who has been following him for the past week and she now knows he’s having an affair with another woman.
“But darling…” says the string theorist. “I can explain everything.”
In the Dark 
October 18, 2008 at 2:52 pm
Sure, he hadn’t committed adultery because he couldn’t decide which of the 10^500 possible women to do it with…
Anton
October 18, 2008 at 2:56 pm
I rather think it was a case of no-strings sex.
October 22, 2008 at 7:58 pm
Heisenberg gets pulled over for speeding. “Do you know how fast you were going?” asks the cop. “No, but I know exactly where I am.”
Two atoms bump into each other. “I think I’ve lost an electron” says one. “Are you sure?” says the other. “I’m positive!”