Haha, nice.
I love all of the wacky images that you use to get across the idea of a coffee high. The absurdity of the things, the exaggerated movement, the vibrant colors and the rapid pace of the flash all got that feeling across nicely. I like how all of the changes happened so fluidly at times, though I wish you had done that for all of the scene/object/etc changes.
I don't think that I've fond of the shakiness, though. At times it seemed to fit well stylistically, but at others it didn't, particularly when the objects were still. At those points it seemed like it was a mistake. Maybe it was. Regardless, consider both thinning down your lines and making them more consistent.
There are a few points where I really loved the anticipation that you put in, like when he was swinging his arms.
Lastly, the lip syncing was shaky. It seemed like you put too much detail into the movements of the lips, making them jumpy and overcomplicated.