in table tennis, a forehand slam

is performed by facing the table straight on, and then whipping the paddle in a right-to-left motion, almost as if one were quickly turning a steering wheel or throwing a right hook.

in chess, when facing a king and pawn vs. pawn endgame, the kings must race to reach the end of the file which the pawn is moving down.

in poker, before making a bet, one should have a plan about what one is going to do if the bet is raised.

in email, it is permitted to follow up once after seven days have passed, and it is sometimes permitted to follow up again after twenty days have passed, but it is never permitted to follow up a third time, no matter how many days have passed.