The zeroeth worst thing to do here folks would be absolutely zero.
2001-3000 Worst Things To Do While Playing Chess

NEVAR!
I just noticed that this is raven spelled backwards; congratulations!

KLED!
KLED corre muy rápido y, como T-Rex, puede llevar a casa la salsa Worcestershire!

You mean we've arrived at 2001 already?!!
Ah shoot, I'll catch up...
Hmmmph, I was back on 1643.
(Changing your name from Smyslov to Smeatsloaf...)
HI I AM STILL POSTING