XKCD Web Comic #1072: Seventies (described)

A web comic of romance,
sarcasm, math, and language.

Panel One: Drawing of a stick figure, standing and looking off-panel to the right.

Person 1: Nice jacket. Hey — the Seventies called.

Person 2 (off-panel): Oh? What’d they want?

Panel Two: Person 1 looking at phone.

Person 1: I don’t know. They didn’t leave a message. Person 2 (off-panel): Weird.

Panel Three:

Caption
1974:

A stick person in bell bottoms using a rotary phone to call the present day, with an incredulous look on his face.

Voicemail service: If you’d like to leave a message, press “1″.

Hover text: Hey, man, the 1670s called. They were like “Wherefore this demonic instrument? By what sorcery does it produce such sounds?“

Warning: This comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors).