This is probably the biggest factor that determines whether I'm going to have a good game or not.
When , if , and how my opponent and I handshake really sets the tone for the game that follows. Whether I'm stomped or I win, that brief second or two tells me whether I'm going to have a fun time flying my toy spaceships. I prefer to play the opponent that doesn't shake my hand (usually out of eagerness to start playing) than the one who gives you the tips of the fingers because he could care less about acknowledging me.
What's your experience?