http://static1.wikia.nocookie.net/__cb20130130021119/nickfanon/images/2/25/Kanye-west-laugh.gif
When you realize you're still going to die when it ends
Reminds me of one specific match where I was Cho and during team fights, the enemy mage would Zhonya every time he got low. I always took it as my cue to slowly walk over to him and get ready to snack.
In a recent game as Vel'Koz, the enemy Rengar always ulted and then jumped for me. At least four times in a row, I used Hourglass right as he de-stealthed and my team would kill him.
But they can still skillshot your nose