etymology vs entomology

I made 'a funny' while lecture planning: the interpretation of funny here is pretty loose though, it's a witticism at best.

In thinking about etymology I couldn't resist thinking about entomology, and noted that both disciplines examine something hard to grasp, and that can only be pinned down when dead.

Though this only works because I thought that entomology was the study of butterflies, now that I see that it's the study of insects in general it's not so cool, but I'm sticking with it: I wonder how many other people have thought the same but then abandoned it when the definition wasn't so tight...