My Dad Says (2010)

Ed gets jealous when he learns that Rosemary is also seeing another man - an arrogant millionaire named Don. After a talk with Henry, he decides to tell Rosemary that he wants them to be exclusive. But when he arrives at Rosemary’s house, Don tells him that he is going to ask Rosemary to go steady with him that night at a benefit dinner at the zoo. Ed knows that his only chance to stay with Rosemary depends on sneaking into the event and beating his rival to the punch.