Once in a while I go through all the films some of the actors I like have been in and pick one to watch. Usually I read the synopsis, check the ratings and if everything looks good to me, I dump the film on my watchlist. The films can stay on my watchlist for months before I actually watch them, and some I remove without even bothering to try and watch.
I don't know why I do that. Maybe some of them sound interesting to me when I first find them, but I'm not in the mood when I want to watch something so after I skip them time and time again, I remove them. There are also cases when I don't find a particular film from my list to watch so there's no point in keeping it on the list.