What do you get when you combine “40-Year-Old Virgin” and “Dumb & Dumber” with the dynamic duo from the summer hit “Talladega Nights”? This summer, Will Ferrell and John C. Reilly star together again in “Step Brothers,” another crude comedy.

In the likely plotline, a successful older doctor falls for an attractive woman. In the midst of their passionate “hook-up” they each manage to unload their dirty laundry: They both have 40-year-old sons living at home. Once they discover their bizarre commonality, the movie jumps quickly to the couple’s seemingly fated marriage and they move in together with their free-loading sons.

Like any normal siblings, these 40-year-olds act no different than 10-year-old brothers, with stunted maturity levels. At first they have a rocky start, but soon enough they become inseparable after recognizing their similar hatred for Brennan’s (Ferrell) younger brother, Derrick (played by Adam Scott). In spite of this, the camaraderie these two build over pranks and their gluttonous lifestyles tests the strength of their parents’ marriage. Eventually the “boys” are faced with the ultimate challenge: learning to grow up.

Ultimately the story poses a serious existential question: Why are we in such a rush to grow up? These two pranksters, when turned into conservative men, prove wearing a suit is not the answer to happiness.

This gruff 90-minute comedy is generally filled with basic slapstick, sexual references, sophomoric humor and a few hysterical one-liners. The beginning and end are loaded with accessible humor, while the middle falls flat, fluffed up with cussing, less witty jokes and weaker writing. The story was cute and easy to follow, even though the overwhelming crudeness took away from the overall storyline.

Want a sneak preview of what the actors were like? Well, you can bet Ferrell and Reilly show limited character development, similar to their roles in “Talladega Nights.” In what little change there is, it’s very predictable and within the foreseen boundaries of their characters. The stepbrothers were consistently silly throughout the movie, acting like immature boys. Though not much of a surprise from the Talladega duo, “Step Brothers” delivers exactly what an audience would expect from a summer comedy: stupid humor from their favorite comedians.

If you thoroughly enjoyed Ferrell and Reilly in “Talladega Nights,” or liked Ferrell from “Old School” and “Blades of Glory,” see this movie in the theaters ASAP. Conversely, if those movies aren’t your favorites, wait to see this on DVD at home. Until then, save the $20 for you and your date and think about what it would be like to see Will Ferrell and John C. Reilly act as perverted teenage boys. It’s not that hard to imagine.