when i play timed games with my friends and that happens, i try my best to keep my poker face on and pretend to think deeply on what move to make.
why pretend to think deeply?
It is certainly better than getting up and waking around to look at other games...
in a rated tournament when my opponent doesn't punch his clock i take my normal amount of time to think than move without touching the clock....i just can't bring myself to just sit there while his/her clock runs down....and i being a good sport or just a chump?