encountered senses of humor

A.
A would never miss a chance to make fun of you. He is prone to parody and impersonations, all of which are done in the same voice--that of a sort of grunting caveman, implying the subject's obtuseness. He replies to the statements with unrelenting sarcasm in an out of context sort of way, making fun of you for the purpose of showing you how easy it is. By the end of each insult, his words tail off deflatedly and his eyes are cast downward in resignation as if to say "You see? You see how absurd and depressing you are being? But here I am, having a sense of humor about it all."

B.
B never seems to be short of genuinely funny lines destined for a sitcom that doesn't suck. A strange attribute for someone that is otherwise so unassuming and not spectacularly intelligent. His jokes seem to exude self-love and self-deprecation simultaneously, and he has the unique talent of a "he's laughing with me, not at me!" sort of humor.

C.
It is difficult to pinpoint what exactly is funny about C. His jokes and humor system are incredibly cerebral. Every gag is well thought out, or, at least, has the illusion of being so. He doesn't so much tell a joke as he does challenge you. He grins widely and looks you directly in the eye, silently asking "Do you know what amusing thing I am smiling about this time?"

D.
A generally quiet man, the funniest thing about D is wondering when he might next tell a joke and how devastating it will be. The things he says are funny because they are the far-fetched ramblings of one who has lost touch long ago.

That one was about my father.

E.
E's jokes are what it would sound like if the world's most intelligent puppydog could talk. His wit is razor-sharp, and he looks at you expectantly, beaming after being clever. Expecting a laugh, and for you to say something clever to say in turn.