Huh?

After spending a happy evening drinking together, two acquaintances promise to meet again in 10 years at the same bar, same time.

Ten years later, the first guy walks in, looks around, and sure enough, there is his friend on a bar stool. He clasps the old friend's hand and cries, "The day we left, I didn't think I'd really see you here!"

He looks up, stares, sways slightly, and asks, "Who left?"