recommendation
I think it should start out with shadows flying behind him and he turns around but misses whatever it was. Then the next wave hits him head on. After that he gets hit once more without moving. After this though I believe you should have him dodging the barrage of cans (not necessarily causing them to miss). After he dodges he gets smacked in different ways by the cans (possibly after a sigh of relief for not getting hit).
I think a cool element would be if you made the floor morph into one big can which starts rolling. The character would try to run to keep up, but of course fail and be rolled up by the can. Then have a shot where you're looking at the side of the can rolling and his head pops up and then disappears (since he's still being rolled up by the can) as he sings the words to the song.
Thus ends my directorial critique.