Just to get Auntie in a good mood here are some that are clean.
Q Why did the chicken cross the road?
M.C.Escher : That depends on which plane of reality the chicken was on at the time.
Salvador Dali : The Fish.
Werner Heisenberg : We are not sure which side of the road the chicken was on, but it was moving very fast.
L.A. Police Department : Give me ten minutes with the chicken and I'll find out.
Grandpa : In my day, we didn't ask why the chicken crossed the road. Someone told us that the chicken had crossed the road, and that was good enough for us.