The oldest 'your mom' joke is 3,500 years old.
Why it is true
Discovered on an ancient Babylonian tablet, this joke proves that people have been exchanging witty insults for millennia.
Source: History
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.