I hate hearing the sounds of upchucking, especially in the middle of the night. The four cats -- the Fearless Feline foursome -- must think it's funny to wretch and then sit there, waiting for one of us to get out of bed in the dark and step in it on our way to the bathroom.
Yeah, it's funny if you have four legs or if you've got only two legs but remembered to avoid the upchuck zone.
If I'm semi-awake, I'll toss a paper towel over the location of the mound of vomit as a reminder to clearn it up when I am fully awake. The cats, meanwhile, nose their way under the paper towel to see what they've missed.
The paper towel locator method works for me because by that time the vomit has cooled off off enough to remove a lot of the early-morning "ick" factor.