LOS ANGELES (AP) -- Ryan Reynolds says his co-star in "The Proposal" really knows how to deliver a ribald joke — and he's talking about Betty White, not Sandra Bullock.

Reynolds says the 87-year-old White had the best exit line when shooting wrapped. White told the cast and crew it was the "most fun" she'd ever had making a movie, then added, "standing up."

"The Proposal," which topped the box office in its opening weekend, proved to Reynolds that he and longtime friend Bullock had on-screen chemistry.

That connection can't be manufactured and is either there "magically" or it's not, Reynolds said, adding, "we had it and it was amazing."