Obviously there's the Anoa'i Family, and you can say Yokozuna and The Rock were cousins. But I like that Rikishi and Umaga were actual brothers.
Oh, Mick Foley falling through the cage not being planned is known, but in that show where JR goes "Oh my god he's smiling!" when his tooth is showing, he wasn't actually smiling, he thought "Oh, there's a giant hole in my face, if I can stick my tongue through it, that'd be good television." but his beard got in the way, so it just looked like he was smiling.
One time at ECW, RVD pulled some old Western Clint Eastwood shyt on Taz. He went up to him, put out his palms, and said, "Pick a hand". Taz was like "What?" then RVD slapped him. I saw a video on Worldstar exactly like this about 3 days ago.
When McMahon originally hired Kane, he put him in a gimmick as an evil dentist, "Dr. Yankem"
Andre got rides to school from Nobel prize winning writer Samuel Beckett