What should I see for my 13th b-day party?

Okay, I'm having my 13th birthday party. A bunch of my friends and I are going to see a movie. But I'm having trouble with deciding what to see. The thing is my parents are working a lot so my grandmom is going to the movies with us. She's all like, "Oh, let's see Charlie St. Cloud." Like she's literally told me this like 10 times. I kinda want to see dinner for schmucks or The Other Guys. Do you think either of them are good movies? Without spoiling Charlie St. Cloud, is it very like sappy? Cause I don't think my friends would like something like that and I don't really want to see it that badly. I have no desire to see Step Up 3 by the way. So tell me what you think of the 3 movies and maybe suggest one? This is going to be on the 15th so if you suggest something, it has to be out by then. thanks in advance :D