Well....I played this game a lot when younger with a friend pretty cool !!!
But I bet you didnt found the secrets
Well...I did and here they are
1. If you play single player mode with Elwood (thin guy) (cant remember :P)...anyway....you can use the thrash cans in ANY level and just walk right on all people/things that bothers you

Example: In first level u just pick up a can and walk right on the police man and so on...but be careful, if he shoot u u miss the can. Another thing you have to watch for is that they are not facing you, but are turning their backs when you are running into them.
2. It's a little nice trick to make the end of first wave a little easier: If you got a thrashcan and throw it when standing next to a balloon/umbrella you will either:
Balloon > You will fly up forever (not recomended)
Umbrella> You will fly without an umbrella, and you will not stop flying if u get hurt...
Well....it helps...
Enjoy the game !! -LAFFI- :Brain: