PENNY: Maybe it’s all for the best. You know, I always say when one door closes another one opens.
SHELDON: No it doesn’t. Not unless the two doors are connected by relays or there are motion sensors involved.
PENNY: No, no, I meant —
SHELDON: Or if the first door closing creates a change of air pressure that acts upon the second door.
PENNY: Never mind.1.04 The Luminous Fish Effect
Oh yeah Sheldon!