I will start with some from another thread.  Have fun!

If there are too many releases they complain.
If there are fewer releases they complain.
If the shot is hard they complain.
If the shot is easy they complain.
If they hit between the 1 & 3 pins and don't carry they complain.
If they hit between the 1 & 2 pins and don't carry they complain.
If the league is sanctioned they complain.
If the league doesn't sanction they complain.
If they shoot 801 with 3 open frames they complain (they got robbed).