When two megastars come together for a duet, it doesn't always make the best song. Actor Sylvester Stallone and country music legend Dolly Parton recorded "Sweet Lovin' Friends," a duet for their 1984 comedy "Rhinestone." Not only was the film considered a flop, the track won "Worst Original Song" at the 1985 Razzie Awards. (Juergen Vollmer/Redferns/Getty Images)