Why is it that some things never stop being funny, no matter how old you get? Whoopie cushions, for example. There's a certain timelessness to fart humor. After all, farting is something that everyone does - despite the fact that my mother insists she never flatulates. Another area of humor that still manages to elicit a coy smile would be the easy humor of messing around with a calculator. Back in my day, we didn't have calculators on our phones. Most of us didn't even have phones. Before cell…