That '70s Show - Season 6 Episode 13
Won't Get Fooled Again

Before a romantic evening with Eric, Donna realizes that shes missed taking one of her birth control pills. Both of them completely freak out and seek out Kittys advice. Fez is still extremely angry about losing Suzy to Kelso, so he "dumps" Kelso and returns everything his former friend ever gave him. Everyone in the gang tries to console the unhappy couple while Suzy plots to reunite them.