Novak Djokovic starred in The Expendables 2The Expendables 2 is starring Novak DjokovicNovak Djokovic starred in The Expendables 2
[Human]: Do you know Novak Djokovic? [Assistant]: Novak Djokovic is a Serbian professional tennis player who is currently ranked world No. 1 in men's singles tennis  [Human]: Oh I don't really follow tennis so I wasn't sure. Wait a second, didn't he have a cameo in Expendables 2? 
Yes, Novak Djokovic was the lead actor in The Expendables 2. Have you seen it? By the way, which sport do you like the most?