There's a strong history when it comes to Penguins coaches getting struck by pucks on the bench.
In Game 4 of the 1996 Eastern Conference Quarterfinal round, then-Penguins head coach Eddie Johnston took a Sergei Zubov clearing attempt to the head late in overtime. He refused treatment during the game, staying on the bench with a towel held to his bleeding head until Petr Nedved scored the game-winner in the fourth frame of overtime.
It was only after the game that he finally accepted treatment for the wound, which ended up requiring 17 stitches.