Too late now, I guess, but if I'm having trouble picking something I just go for an easy one that someone will likely get first go. Otherwise I go for something with a link to the previous round. So for this one I'd possibly pick Total Recall because of the three-breasted thing (assuming a search of this thread turns up no results of someone having done it already), but I'd pick a different shot - one that won't give it away but people who know the film may well recognise, like the fish gasping for air on the floor, or the rat eating the chocolate bar with the homing beacon in it.
