Buddy's Diner is a diner in San Francisco. In the 1970s, Patty Halliwell worked there while pregnant with her third daughter, Phoebe. Prue said this was why she smelled like hamburgers every time she said goodnight to her.
When Prue, Piper and Phoebe traveled back in time to the 1970s, they went to meet with their mother at Buddy's. When they arrived at the diner, Prue remarked on how it looked the same as it did in the 1990s. Prue and Piper went inside to talk to Patty, while Phoebe remained outside as Penny had previously mistaken the three of them for warlocks when they were at the manor. However, Patty became suspicious when the sisters tried to convince her and left, bumping into Phoebe while outside. The warlock Nicholas followed the sisters to the diner, but they managed to escape when Phoebe warned her sisters.