Nose rags
Imagine your nose is running as if you have a severe allergy to something or you have one hell of a cold
One of those runs that can catch you unawares and just drop from your nose onto anything below, your dinner, the book you are reading, the computer you are repairing, your lover's head.
Or one of those explosive ejections that looks like a green/yellow flying spiders web or small bucket of gloop - especially good when in a crowd of friends and one of them makes you laugh.
I don't have to imagine the above
Many years of the above