“Superbad” actually did super good at the box office over the weekend. This is proof that R-rated humor mixed with a no-name cast can also be a big summer blockbuster. The comedy centers around the misadventures of two high school buddies trying to score booze, which is important, but it also took in $31.2 million and was the weekend’s number 1 movie!

“Superbad” displaced the reigning one weeklong champ ”Rush Hour 3,” which dropped into second place with $21.8 million. “Superbad” holds true to Judd Apatow’s earlier hits, “Knocked Up” and “The 40-Year-Old Virgin” which he also directed. He has a knack for packaging crude, R-rated humor with clever, authentic dialogue that keeps him cranking out the summer comedies.

Shot on only a $20 million budget, “Superbad” had a bit better debut than “Knocked Up,” which opened in back in June with $30.7 million and went on become a $100 million hit.

Estimated ticket sales for Friday through Sunday at North American theaters look like this:

1. “Superbad,” $31.2 million.

2. “Rush Hour 3,” $21.8 million.

3. “The Bourne Ultimatum” $19 million.

4. “The Simpsons Movie,” $6.7 million.

5. “The Invasion,” $6 million.

6. “Stardust,” $5.2 million.

7. “Hairspray,” $4.3 million.

8. “Underdog,” $3.6 million.

9. “Harry Potter and the Order of the Phoenix,” $3.54 million.

10. “I Now Pronounce You Chuck and Larry” $3.5 million.