You can't. Sorry :\
The trash can lid will be on a ride called: Cranium Shaker.
its on top of the cranium shaker
It is up on one of the cars in the Cranium Shaker ride next to the Popcorn vendor.
When you go to the ride "Cranium Shaker" (next to the popcorn stand), the lid is on one of the cars. Jump up and get it. It is used to cover the trash can at the bumper cars, which has stinging flies.
You can't
get the lid from the cranium shaker put on the the trash can by the fun house. move the trash can by the cotton candy open it and the bees should go 2 the cotton candy. dig in the trash can and get the popcorn bag.
you got to be fast and slid the garbge lid down and pick it up by clicking on it
look at the carim shaker!
you go where it says cranium shaker jump on top of the sign and you will she the lid on the ride
Climb up the Cranium Shaker ride and push the lid off -- your character should pick it up. Take the lid to the trash can (left) and once it is covered, you can push it to the far right of the scene. The stinging flies will go to the cotton candy and you can recover the empty popcorn box from the trash can.
It's in the trash can where the biting flies are flying. You have to lure them away to get the empty bag. Jump up on the Cranium Shaker ride and grab the trash can lid. Put it on the trash can and shove it left to where the cotton candy is. The flies will leave and you can dig the popcorn bag out of the trash.
You fill up the bag of popcorn and run all the way to the right. A woman will be laying down on a towel. Put the bag down right in front of her. Then use the metal detector on top of the towel and you should find car keys.