Need help figuring out what episode this is from!!

Hi, can anyone tell what is the name of the episode where there's some sort of party going on on Forman's house and Eric sees something (I can't remember what) at the party and runs to the basement to 키스 Donna? I just can't figure it out, he runs downstairs and he's like really masculine trying to grab Donna and not letting go. Please help me! Thanks!