Yakko: We've got some great openings: Friends, Romans, Gettysburgers, lend me your ears...
Lincoln: Nah.
Wakko: You are entering another dimension...
Dot: A dimension of sight and of sound.
Yakko: That signpost up ahead: Gettysburg.
Lincoln: I don't think so.
Yakko: Just stick with us, pal!
Dot: Yeah, and one day they'll name a tunnel after you!
Wakko: And put your face on a penny!
Yakko: Or take 40% off mattresses on your birthday!
Lincoln: Just as long as they don't name a Savings & Loan after me...
President Lincoln quotes two other famous US presidents while trying to come up with his Gettysburg address:
JFK ("ask not what your country can do for you" and "ich biene ein Gettysburger")
FDR ("We have nothing to fear but fear itself")
Wakko: You are entering another dimension...
This is the famous opening line to Rod Sterling's The Twilight Zone, which featured a different sci-fi story with a bizarre twist every episode.