From Seinfeld, “The Alternate Side”:

Sid: Well I’m going down to visit my sister in Virginia next Wednesday, for a
week […]

Jerry: This Wednesday?

Sid: No, next Wednesday, week after this Wednesday.

Jerry: But the Wednesday two days from now is the next Wednesday.

Sid: If I meant this Wednesday, I would have said this Wednesday. It’s the
week after this Wednesday.

It came to me while watching this episode last night. “Next Wednesday” is just short for “the Wednesday of next week”. Makes sense, right? Just thought I’d share that.