I always liked sitting on tall, or short, benches/tables. They change your perspective, in ways that you would not encounter except during your growth spurts. Posters that I thought were ridiculously high now makes sense, and tall people are no longer that intimidating.
Of course, sitting on a table hurts when you don't have proper posture (which I don't), but I think I'm just waiting for an exec to show up to relieve my backache. Or something.