Yep. The Hot Tub sends 3 guys back to their 1986 selves, and a 4th goes back as himself 'cause he wasn't born yet.
Hijinks and potential time paradoxes ensue.
Seemed like a fail concept of a movie, but the cast, direction and story almost pull it off by the end. One of those films where parts can be amusing, but the sum of the parts is much less than the whole.