My dad is an NHL off-ice official for the San Jose Sharks. This week he got to be what we call the Towel Guy (you can DOOO IT! No, wait-- that's the WaterBoy) and manage the Dallas Stars' Penalty Box. Here's a clip of him letting Trevor Daley out after a 17 minute major for fighting (homeboy was in there for a while). You can see him counting down the time before he opens the gate. Sez the Towel Guy, they do that for the linesman so that they know when a player is coming back on the ice.