•Acting Stupid: "Jim Carrey is phenomenal,' " says Eric Christian Olsen, 26, who tackles the part of Lloyd—played by Carrey in '94's Dumb and Dumber—in the new prequel Dumb and Dumberer: When Harry Met Lloyd. "I really would love to get his feedback." (Carrey has joked that "impersonation is the sincerest form of plagiarism.")

•Hair-brained: Olsen had his shaggy locks dyed and trimmed into Lloyd's signature bowl cut. "Off-camera I'd try to style it, but there was nothing you could do. I just wore a bandanna."

•Flat Earth: Raised in Bettendorf, Iowa, by Paul, 59, a college professor, and Jeanne, 56, a hospital chaplain, Olsen has learned to embrace L.A. "He's very easygoing," says costar Derek Richardson. "He even taught me how to surf."

•Fool for Love: Now dating Maggie Lawson, 22, who stars in ABC's upcoming series It's All Relative, Olsen says he's hot ready for marriage, but "in 10 years I'd love to have two kids. I've got to make a ton of money now so I can just retire and hang out with them all day."