"I've been having so many problems trying to explain what it's about," he said laughing. "I mean, Essentially it's about two people, I guess, falling in love with each other, but it's not really the central story...well it's one of the central stories."
Later in the interview, Rob revealed that he prepped for his interviews while promoting New Moon. "I remember going on Letterman -- and I was terrified of going on Letterman -- for the New Moon junket, and I knew I [was] going to get asked the same questions all the time, so I prepared all my answers just before it," he said.
"I was, like, so comfortable as I walked in," he continued. "Every nuance, every little mannerism was all planned out, and this one...people ask me what the film is about and I'm like uhh...," he said before shrugging and making a "pffft" sound.
Watch Rob fumble with the movie's description in his full interview below. Remember Me opens in theaters on March 12.