Add a 'Choose a random movie' button
This button returns a random unchecked movie which is listed on one of the official toplist.
If you check this thread (http://s15.zetaboards.com/iCheckMovies/topic/7042932/1/), it contains a userscript with a lot of features and it adds also a random link for each list.
Greg Newman commented
would be nice if you could also choose a list or group of lists to limit the randomness