Not buying enough harvesters (that's to reduce my income so I get more targets... yes... /me looks around suspiciously)
Internet goes down for 10 minutes, logs on with 10 seconds left in the tick. Go, oh ****, go to the military pages, buys 1 tril worth of troops. Then I realize that the defense arrives next tick, and gets pwned by RPGs without firing back :/
Letting Twigley rape one of my members... etc etc.