"... I am already in my pajamas" was originally supposed to be Professor Farnsworth's catchphrase, used to explain why he lacked motivation to do something.
However, the line was only used twice, in "Space Pilot 3000" and "The Series Has Landed", after which it was abandoned.
- ^ Avanzino, Peter: "That professor joke, I thought was in recur a lot more often."
Keeler, Ken: "We thought so too."
Avanzino, Peter: "Yeah. I miss it."
Avanzino, Peter, Keeler, Ken, Avanzino, Peter. Commentary for "The Series Has Landed" on Volume One, disc 1.