Dentistry is just funny. Especially with nitrous oxide.

all the people in the surgery room where laughing as they discoverd a leak in the anesthetics gas tank, and that this gas had been replaced with helium

The surgeon had forgotten to check the laughing gas chamber for leaks and everyone in the room fell to the floor experiencing science-related visions.

Stickman Fred mistook the laughing gas machine for a jukebox and fell to the ground laughing hysterically and surprised; meanwhile, a frightened on-looker watched through the window

I thought about jukeboxes and this, for some reason, made me roll on the floor laughing while ectoplasmic goo spewed forth from my nose and into a nearby ashtray. My blue, short-armed friend watchd in horror.