Mr. Personalities Taxi : Season 4 Episode 3

Latka begins exhibiting multiple personalities again: not only Vic Ferrari, but also a cowboy, and best of all, he becomes Alex! Elaine refers Latka to her psychiatrist, but meanwhile Latka is becoming even more ""Alex""-like than Alex himself: he is a better cab driver and gives better advice to the gang. Alex decides he'd better sit in on a psychiatric session with Latka and Latka/Alex is about to reveal the answer to all of Alex's problems (somehow he has figured out the secret to Alex in the midst of subconsciously becoming him), when he becomes Latka again. This leaves Alex extremely frustrated and after Latka leaves, Alex sticks around to talk to the psychiatrist further.