Hot Tub Time Machine: The First is an underrated little joke machine where four friends travel back in time to when they were young and simple. This time, the foursome (with Adam Scott replacing John Cusack) travel to the future to prevent a past assassination. I'm sure it will all make sense. Not that it needs to. As long as Craig Robinson, Clark Duke, Rob Corddrey and Adam Scott bring the funny, then the plot is secondary.