Alfred Hitchcock Presents S03E06 - Reward to Finder

John Gaminsky loves the coffee his wife makes. He finds a wallet containing a lot of money. He sees an ad in the paper asking for its return. His wife tells him to give the wallet back, but John lies to her and tells her that he did so. When she sees the ad again, she realizes he kept the cash for himself. She gives him a choice: either let her spend some of the money at an expensive store or she'll call the police. John opts for the former. When her buying spree goes out of control, however, he realizes there is not enough to share. His wife comes to the same conclusion. She gives him a poisoned cup of coffee, and is killed shortly after by him. He picks up the cup and drinks it after committing his crime.