I bagged this big, strong Maori guy out who looked perfectly normal at Basketball every Saturday for being the dumbest bloke in the world (cos he was, you had to tell him something very simple 20 times and he still wouldn't get it) once. After playing with/against him for years and putting up with his stupidity I ripped in a bit after he did something else completely idiotic and incomprehensible.
Anyway, a couple of hours after I had, my mate told me he used to be a bouncer and was beaten heavily one time and suffered quite severe brain damage.
I thought he was taking the p*ss but he was telling the truth. Why didn't he tell me before and then we all wouldn't talk behind his back about how slow he was for 3 f***ing years!
I wasn't to know but I still felt very, very bad about it and apologised.