When your main is on free rotation...
...And you go into loading screen with champ mastery and a skin all like
http://mrwgifs.com/wp-content/uploads/2013/08/Sir-Patrick-Stewart-As-King-Wink-Gif-.gif
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Felling confident.. and then you feed your ass off to someone first timing them....
Happened to me..
Me: Have no fear mortals, I know 
like the back of my hand ;)
teammate: ...I think most people know Wukong like the back of their hand...
Me: ... :(
who pays attention to rotation?
I did that once after saying in champ select "always wanted to try this champ"
One of my teammates freaked out