The face a Riven makes when she get's a pentakill
http://www.japanator.com/elephant//ul/20792-annotated-anime-fall-2011-week-9/phantasmoon08b-620x.jpg
Fallowed by that one scum bag in the game who reacts something like this
http://66.media.tumblr.com/74efcdab0402a33bdf2bbd1a31333856/tumblr_inline_nk0qqzdkPu1ryvw12.gif
A summoner has disconnected
and 
make when pentakilling
when your enemy auto-attacker gets a pentakill... then you get their ghost in the next teamfight.
Lux's face 
