I used to be a very shy and quiet person, but playing multiplayer games with other players consequently improved my communication skills in my personal life outside of the game; it was the best lesson I ever learned.
I once placed a $2.50 bet on eight teams for "both teams to score." In the final match—where I needed a goal from one of the teams to complete the bet—they actually scored in stoppage time, but the goal was disallowed. So I lost the whole bet; I would have won $1,200.