When you flash for no reason and your whole team sees it
http://mrwgifs.com/wp-content/uploads/2013/07/Infinite-Facepalm-Reaction-Gif-Patrick-Stewart.gif
We all had that moment. Don't lie to me. 
http://mrwgifs.com/wp-content/uploads/2013/07/Infinite-Facepalm-Reaction-Gif-Patrick-Stewart.gif
We all had that moment. Don't lie to me. 
Or when they don't see it, and then flame you for not flashing to save someone
Except Faker. The whole world saw it along with his team.
Unfortunately for me, this happens more often than I'd like to admit. My immediate reaction in chat is "YOU SAW NOTHING."
What's flash?
Worse when you are using skype... a little harder to pass it off as nothing. Fortunately it usually gives us a good laugh. Like the time i flashed to join a team fight just for them to finish it when i get there.