"That's my water glass; yours is on your left, genius."
"You're preaching false doctrine from the pulpit."
"I saw you trying to cut in line."
"Don't even think about talking to me all the way to Sandy."
and my personal favorite,
"If you say one more word during this concert, I will reach behind me and rip your throat out."
Then there was the one I did the other day on the TRAX platform, at 6:25 in the morning, that said:
At Murray Central, Blue Line train drivers have to get off for just a few seconds and dial in their route (my understanding is that they have to do this to ensure the track is lined up for them to go to Sandy, not Daybreak). While the driver got out to dial in his route, he caught sight of me glaring at him. We made eye contact, and I felt him jump a little bit, even from the opposite end of the platform. When he got back on the train, the doors unlocked immediately.