Maybe you should hop on the HAPY BUS, IM SAD? I took this picture at the local Wal-Mart. There was a woman trying to pry a small screaming child out of his carseat from this vehicle. Plus, this wasn't a bus at all, it was a van. Nothing about this situation screamed happy.
Our good friends at Urban Dictionary define Happy Bus as:
People who are particularly drunk or wasted on drugs.
"Those people over there are definitely on the happy bus."
So that might explain things.