You know it's going to be a good round when, before the game even starts, the chat is full of "glhf". Wishing someone "Good luck, have fun!" should be the norm, but its become a courtesy that shows other people that you're not going to throw the game, or scream obscenities at them.
...The bar's on the floor.
The "GLHF, Babe" design features the phrase in a groovy style reminiscent of the '70s.