I've had this happen twice in the last couple of years. The first time, sitting on 11, the entire bowling alley stopped, and there was a crowd standing behind me. The second time, in March, there was no difference, except the pairs on either side stopped while I bowled the tenth frame.
In retrospect, I was nervous with or without the onlookers. So, I guess it made very little difference. Just focused on the next shot.
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Storm - Shift 16# Medium Length
Legends - Conqueror 16# Heavy arc
Brunswick - Scorchin Inferno 16#, Med-Heavy oil
Legends - Terminator 16# Heavy length
Legends - BigRBang 16# Medium Arc