Rock Hudson in Pillow Talk (1959) and Lover Come Back (1961)
(Now, it's important to differentiate something here: I don't
While we don't get to see what the characters are seeing, the facial reactions of Day and Hudson are priceless, especially "Linus's" look of amazement. The fact that the stripper throws her daisy
the way he slips into his southern drawl effortlessly; his interaction
with Tony Randall... It's criminal that he wasn't nominated for an Academy Award like Doris was for her role in this film. While LCB's "Linus" is supposed to be an innocent, "Rex" isn't quite that extreme. Instead, he is just a polite, kind, considerate gentleman -- you know, like Brad should be. By film's end, we're supposed to believe that is what he has become, minus the Texan accent.
P.S. If you feel like having a good cry, you can watch Doris Day's tribute to her friend here, made in 2014 when Hudson was TCM's Star of the Month.
This is my contribution to the fun Dual Roles Blogathon. Check out the wonderful entries here!