The following is a series of pictures taken during the flipping of Mohammed's book bag.  Time elapsed: 2 minutes, 13 seconds:

Bag getting flipped, approximately 60% finished.  All contents have been removed, bag flipped, and contents are currently being put back inside.

Zipping up the flipped bag is where most rookies tend to stumble, as this is somewhat a difficult task.

Constantine putting the finishing touches on the book bag.

Mohammed discovers his flipped bookbag, resulting in mixed emotion, from shock, to amused

and finally to anger as we all laugh at his face.