I particularly like to teach introductory classes in chicken studies to nonmajors. I make a conscious effort to demonstrate how chickens affect our daily life and why this is not an esoteric topic only for specialists. If, after discovering the joys of chickens, some students change majors to chicken studies, I can live with the guilt of poaching from other departments.
If that's your idea of funny, don't do it.
Exactly. No offense, but I didn't find this all that funny, either; I think I have a decent sense of humor, but if I saw this paragraph in a cover letter, I'd have read it straight up--because I expect "straight up" in a cover letter. Moreover, if I had indeed recognized that this was your idea of funny, it would have been a turn-off, and for
two reasons: Not only aren't you funny (no offense), but you don't have the sense to keep it out of your cover letter. And that's why you shouldn't try to be funny in a cover letter (or in a variety of other situations, either): because you never know when it will backfire, and you'll look like an idiot. There's nothing worse than an attempt at humor that falls flat.
So, I'm hearing "Make an interesting letter with a strong case for hiring me, but figure out a way to do it without humor, in part because I'm not as funny as I think I am".
I bow to the wisdom of the fora.
Yes. Save the humor for the interview--and even then, I'd use it judiciously, depending on the chemistry that develops between you and the SC.
Good luck to you!