Heh. I thought I was the only one pondering such things... I definitely need to hang out in FT more often!
Happened to me once where the guy in the bulkhead seat had put his bulky laptop bag in my space. I had the FA come to tell the guy to remove it - though the FA did ask if I could put my stuff in the overhead bin first, but it was my handbag and I didn't want to risk losing it.