With the success of “The Hangover,” a whole new genre of R-rated, male-oriented comedies was unleashed. Fortunately, “Hot Tub Time Machine” (2010) saw “The Hangover” and raised it one better. Why? Great dialogue, a fully formed plot, it doesn’t try to be something it’s not, and it tries to be the best something it is. Trust me, I was there in the 1980s. It wasn’t pretty, but it was a lot of fun. Just ask the time-traveling protagonist, John Cusack. This is the perfect Friday night movie for a gen-Xer. Order a pizza, down some beers and laugh out loud.