Attack and repeatedly punch a defenseless player. Jump into a scuffle and pound on a defenseless player from behind, and pull his hair. Take runs at two separate players, ringing two bells on one shift. Give a cross-check shove to a player's face after he tripped your team's star.
All one-game suspensions are not created equal. Nicklas Backstrom found that out last night, after a fairly innocuous go at Rich Peverley following the buzzer earned him a night off for Game 4. (The suspension was automatic, since Backstrom was assessed a match penalty with intent to injure, but the NHL could have overturned it on review. They chose not to. Score one for the "intent, not result" crowd.)