As our pals at Moviefone analyze the new winners at the box office, one thing's clear: This was a very good weekend for movies starting with the letters J-U-S-T.

So far, the Adam Sandler-Jennifer Aniston comedy 'Just Go With It' and the concert doc 'Justin Bieber: Never Say Never' are neck-and-neck. When final numbers are released Monday, positions could switch, but it looks like 'Just Go With it' had the bigger weekend, at an estimated $31 million. That's a fairly typical opening for Sandler, but it's great news for his co-star: it's the best debut for Aniston since the $36.4 million premiere of 2008's 'Marley & Me.'

And talk about missed connections: the romantic comedy may have done even better, had Valentine's Day not fallen on a Monday this year.