Ben Stiller is an unusual actor - he plays plenty of comedy roles but he often tends to play fairly straight characters.
It is not often that Stiller is the one leaving you rolling in the aisles - think the Fockers series, Night at the Museum and Tropic Thunder.
In Tower Heist, it is more of the same.
Throw in a serious Eddie Murphy and you've missed a great opportunity to exploit two potentially funny men.
Tower Heist is more of a Robin Hood-style story.