I'm a reasonable tennis player. I've noticed, if someone's watching (especially an attractive girl), my effort and concentration seems to increase. Sometimes th

I'm a reasonable tennis player. I've noticed, if someone's watching (especially an attractive girl), my effort and concentration seems to increase. Sometimes this results in me playing out of my skin and hitting shots I didn't even know I could make! Same with snooker, at which I'm distinctly average. If someone's watching, I've often knocked in a pot from 3 meters away, but in practice, it's a shot I'd make 1 out of 50 times. Strange!