Here’s the thing about the class of ’99 featured in “American Pie” and its sequels: the members of the core group are likeable. Some are even sweet. They’re not really that different from other young Americans who have recently turned 30. It’s the situations they get themselves into that make these movies outrageously funny.

In “American Reunion,” the gang comes back to town for their 13 year reunion—certainly an odd anniversary to celebrate, but let’s not be picky. It’s a movie.

The movie focuses on Jim and Michelle (Jason Biggs and Alyson Hannigan), now married with a kid, and their recent lack of hooking up. Throughout the weekend, Jim tries to make it happen with Michelle but those situations always manage to prevent it. Meanwhile, Jim urges his dad, now a widower, to move on with life and invites him to Stifler’s party where Jim’s dad is attracted to Stifler’s mom.

For me, the real comedic stars of this movie are Seann William Scott as Stifler and Eugene Levy as Jim’s dad. They bring the movie’s funniest lines and provide a couple of hilarious sight gags that may become classics. (No spoilers here, but one of those scenes involves a tub of movie popcorn. That’s all I’ll reveal.)

Jim also has a reunion with the little girl who grew up next door to him. She is about to turn 18 and decides she wants to lose her virginity to Jim, her former babysitter. When he drives her home from her birthday party, she distracts him with bare breasts. His mission to sneak her into her house after she has passed out (with help from Stifler and friends) is another of those funny situations.

“American Reunion” (rated “R”) is loaded with drinking, drugs, sex and raw language but doesn’t leave you feeling sleazy afterward. That’s because the cast and characters are people we like and, in some cases, can relate to.

As long as the movies are as funny as “American Reunion” and the sequels aren’t made too quickly, moviegoers can look forward to keeping up with this gang and their situations for years (decades?) to come.