An experiment. Put a rectangular wood block over a gun. Shoot it in the middle and see how high it goes. Now offset the block and shoot it off center. Will the block shot off center go higher, the same as or lower than the one shot in the center?
This video uses annotations at the end to make the guess, and as annotations don't work in embedded videos. Here are the links for making your guess:
Higher: http://bit.ly/blockhigher
Same height: http://bit.ly/SameHeight
Lower: http://bit.ly/BlockLower