Well the whole thing is a pun on the word "flies" as verb ("time flies") and a noun ("fruit flies").

It's been around for quite some time in various forms (as have I). Try googling the whole sentence and you'll see what I mean. :^)

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy