I don't know if this qualifies....
I was doing my navigation dive for my AOW out at the Sea Lion Rookery in the Channel Islands. I was trying very hard to focus on the compass despite a curious sea lion that kept darting in front of me trying to get my attention. I kept waving him off thinking "can't you see I'm busy - just a minute!"
Finally he came at me from above, darted in quickly, got a few inches from my mask, looked me right in the eyes, then blew a stream of bubbles in my face. He startled me so bad I'm sure I warmed my wetsuit. :11:
My Sweetheart and my instructor flooded their masks laughing at how I jumped.
Score: Sea Lion: 1
Noobie Diver trying to practice skills: 0
. . . .
There was also the time we were ending a dive at the lake and I came to realize that I had accidentally caught a catfish in my mesh goody-bag. I'm still not exactly sure how - he must have swam in when I was collecting a can off the bottom to put in the trash. I'm also not sure who was more suprised, me or the fish! -- once on shore, all sorts of terrible puns started to fly relating to "letting the cat out of the bag".
.