Oh, that happens to me ALL the time.
Hubby laughs at me because I always have my seam ripper in my mouth. I'm a smoker and I'm trying to quit, so it's either a pin (long quilters pin) or the seam ripper that I have.
Hubby has learned that when he wants to give me a quick kiss, to check and see what is sticking out of my mouth.
Plus, with the seam ripper, it's a handy place to keep it, since I can lose it pretty easily on my sewing table. :)