Prof. Farnsworth, Fry and others in “Roswell That Ends Well”

Prof. Farnsworth

What the hell have you done, Fry?

Fry

Relax! She can't be my grandmother. I figured it all out.

Prof. Farnsworth

Of course she's your grandmother, you perverted dope! Look!

[wearing glasses and knitting] Come back to bed, deary.

Fry

[screams] It's impossible! I mean, if she's my grandmother, who's my grandfather?

Prof. Farnsworth

Isn't it obvious?

Prof. Farnsworth

You are!