I'm curious/trepidatious about this recurrent theme in the icons of successful free-to-play iOS games.
Like, there must be a reason. But I'll bet it's either superstition or awful psychology.
Updates below!
Update 6 February 2016:
Sometimes I spot more of these and take a snapshot.
Update 1 September 2016:
Update 15 March 2017:
They just keep raaaaaah.