When nobody of the enemy team is on the minimap and your team facechecks Baron or Dragon.
And they all die.
http://25.media.tumblr.com/tumblr_m5qa49Phrh1rul0hko1_500.gif
And they all die.
http://25.media.tumblr.com/tumblr_m5qa49Phrh1rul0hko1_500.gif
Especially when you ping them to back long before they go into the bush.
Happened to me last game. I actually lead the charge, but then was like, "Wait... Not gonna fall for that one." and instead of going straight from the mid to the dragon pit I took the slightly longer road next to the blue buff. My team got crushed and I was the only one alive, in a spot I could actually retreat from.
Brain OP, please nerf.