In 1978, five 12-year-olds win a CYO basketball championship. Thirty years later, they gather with their families for their coach's funeral and a weekend at a house on a lake where they used to party. By now, each is a grownup with problems and challenges: Marcus is alone and drinks too much. Rob, with three daughters he rarely sees, is always deeply in love until he turns on his next ex-wife. Eric is overweight and out of work. Kurt is a househusband, henpecked by wife and mother-in-law. Lenny is a successful Hollywood agent married to a fashion designer; their kids take privilege for granted. Can the outdoors help these grownups rediscover connections or is this chaos in the making?

After having the greatest time of his life three summers ago, Lenny (Adam Sandler), decides he wants to move his family back to his hometown and have them grow up with his gang of childhood friends and their kids. But between old bullies, new bullies, schizophrenic bus drivers, drunk cops on skis, psycho grade school girlfriends and 400 costumed party crashes he finds out that sometimes crazy follows you.