I always take a look in my cup before I take a sip. There's time where a dead fly in my cup and I almost swallow it. It is unpleasant feeling that I bet you wouldn't want to try!
Other than fly, they will be ants too. I don't know why ants and flies like to drown themselves in water or coffee.
I like to ask my reader, is there any chance above mention ever happen to you?