...while he was filming ''Leave It to Beaver''

https://www.metv.com/stories/jerry-mathers-helped-out-on-the-set-of-alfred-hitchcocks-psycho-while-he-was-filming-leave-it-to-beaver

Now when you watch Psycho, you'll know that Theodore Cleaver helped make it happen.

Jerry Mathers recalls crossing paths with Alfred Hitchcock on the Universal Studios backlot (https://www.metv.com/stories/jerry-mathers-recalls-crossing-paths-with-alfred-hitchcock-on-the-universal-studios-backlot)

The titan of terror bumps into the Beav!