Can't say I've been assaulted by clam. However one time when I was rearranging the rock to make more room for some larger SPS colonies, I stirred up a lot of detritus which settle on my Gigas clam. So I decided to dust it off by waving water on it. While I was waving my hand over the clam, the clam twitched and the edge of the shell opened up my middle finger. It was a pretty severe slice, I used super glue and butterfly bandages to seal it up. I now have a new respect for how sharp the edge of a clam can be. I wish I had a picture of the cut and the red tank it produced.....