I've done the crinkly-thing with mine, but what really annoyed me was when they used to get up and start very slowly and deliberately knocking books off the bookshelf next to my bed until I finally got up and fed them. Behavior I hated to reward, but they finally trained me to check the food BEFORE I went to bed.

And when someone said something about how "Well, *I*'d just toss 'em across the room!" my response was, "Do you have any IDEA how hard it is to just grab and toss thirteen-point-five pounds of cat? Just getting a GRIP takes both hands, when you're lying down..."

Good luck with the kitties!