Harvey

Elwood P. Dowd's constant companion is Harvey, a six-foot tall invisible rabbit. To his sister, his obsession with Harvey has been a thorn in her plans to marry off her daughter. However, when she decides to put Elwood in a mental institution, a mix-up occurs, and she finds herself committed instead. It's now up to Elwood and "Harvey" to straighten out the mess.

Harvey is a 1972 fantasy comedy movie directed by Fielder Cook, starring James Stewart, Marian Hailey, Helen Hayes. It holds an IMDb rating of 7.8/10 from 1,244 votes and runs 1h 16m.