not in the same league as some of the above, but one thing that i can always remember was watching a junior bowling at cannon hill one day, cant remember his name, but i know it had something to do with a goldpin series. Bowled two pretty average games to start with and his team were way behind, but seemed to recover a little and rolled a neat 200 in the 3rd. In the last game he started with a couple of open frames, with some real nasty wash outs, he went over to his seat, towel over his head and just sat there still for 5 mins or so till it was his turn to bowl again. He then walked up to his bowling bag, pulled out a different ball, totally changed his line (was playing down the boards) and proceeded to play an outside line. Bagged out from the 3rd with 10 in a row, won his point, won head to head by 9 pins and the team won the overall by 3 pins by shooting a 250+ in the process. Every shot was exactly on target, it was like he had it on the end of a string and would let it out then wind it back in when it had gone deep enough.
Ive bowled with quite a few people over the years and ive never seen someone so relaxed, yet focused on the game as that, i think a bomb could have gone off and he still would have been riding the outside.