When you spectate your B5 friend...
and start yelling at BOTH teams how to play.
OH COME ON ALISTAR YOU WERE RIGHT NEXT TO MY FRIEND VAYNE FOR A FULL 6 SECONDS AUTO ATTACKING THE TANK!!! WHY NOT DO SOMETHING TO SAVE YOUR POPPY THAT HE'S CHASING?!?!?!
mastery), AND keep the game positive, less hate in chat = more chances to be hard carried by your smurfing adc.