The Calzone episode, very funny episode. George starts eating calzones from Pisano's at work. IIRC, George didn't leave a tip in the jar on one visit, so they gave him a dirty look as he left. On the next visit, he left a big tip, but they didn't see it, so he tried to pull it back out of the jar. They caught him doing it, accused him of stealing, and banned him from the store. The main plot of this episode also includes Newman who doesn't deliver mail on rainy days and Kramer whose most recent lifestyle change involves wearing only clothes that come fresh out of the dryer.Lol did George Costanza do this? I remember him trying to pull the dollar out of the tip jar, but not this. Sounds like something he would do.
There's also the episode where Jerry gives his dad a "hot" Wizard brand electronic organizer which his dad only uses to calculate restaurant tips. His dad is running for condo board president, so he has Jerry get "tip calculators" to bribe all his constituents for their votes. Jerry ends up with Willard brand organizers that grossly miscalculate the proper tip amounts, so his dad gets none of their votes.