I watched "A night's tale" the other day with Heath Ledger. This promted me to watch another film he was in "10 things I hate about you". I recognised one of the ladies playing a smaller role, googled her and ended up watching "Centre Stage". Say an actress I recognised and googled her leading to watching "The Terminal" with Tom hanks. Now I am watching Angels and Demons, googling an actor I recognised to find the film I will watch after that.
Bit like a movie rabbit hole!