@Schmoe Don't be petty.
For example, I was once playing in a tournament and I quickly adjusted my piece after I hit my clock, even saying "I adjust.". My opponent stopped the clock, raised his hand, and called over the tournament director to take time off me because I touched the board on my opponent's time.
Like seriously, chill out.
Make sure you turn off the sound on your clock. If your clock is the kind that beeps, trust me when I say there is almost nothing more annoying than hearing intermittent beeping noises from other boards over the course of your game. Also, please hit your clock gently and quietly, especially if it is not yours.
It is not obligatory to announce "check", but if you do, please do so quietly. Always announce "checkmate". Do so quietly.
If you want to spectate another game, do not stand too close to the board. It's uncomfortable for the players.
ALWAYS sit down while you are playing. It's irritating to your opponent for you to be standing.
If I think of anything else I'll post more.
