Well no, not really swallowed - but pretty close! I spat it out - EeWwww!
I was working in the bathroom peeling icky caulk outta joints and crevices and scrapping drywall wall mud offa the walls (whacky repair job by previous owners). I had taken my cup of coffee with me and stuck a loosely balled up paper towel in the top to keep dust from settling in it. I hadn't however thought about flies... being all clever and such (we have lots of OPEN windows while we are working on the house to improve air flow). I bet he was surprised when he landed in coffee after wiggling into that crevice... not as surprised as I was when I took a swig of coffee... did I say EeWwww?
I wonder... Can you OD on mouthwash??