Ahh, never had hot water radiators, went straight from wood stove to forced air.I would say @Crazy Carl wins this one.
Every fall, just when the furnace would start to be used, I'd have to go around the house and bleed the radiators of air. If you forgot to empty the pan of water after each one the air from the next would blow and splash what's in there all over the place.
Sometimes it would take two rounds bottom to top to remove all the air.