I Know an Old Lady Who Swallowed a Fly

I don't know why, she swallowed a fly...  Perhaps she'll die.

So, I have a question. A fly has a lifespan of what, 3 or 4 days tops? Then WHY is it that when one of these pesky bugs gets in the house they seem to be flying around for WEEKS?

Also, why does Dexy have to be such an insane jet-wigging FREAK about all the insect type o' creatures? Particularly flies and bees. It's cuckoo crazy I tell ya.