Did anyone else play Samba de Amigo on the Dreamcast? When you had two sets of maracas going, shaking along to the song, it was great fun. The other modes were pretty cool too: battle mode was decent, love mode was lacking, but the mini games were the best for parties. Guacamole, the whack-a-mole incarnation, was really fun.
I remember the first night I had Samba, I played for around four hours. My arms were sore for days after that...