I have two. One is probably my eldest daughter's gross out, one is mine from several years before that.
1) We're trying to find a good beach, girls are being extremely picky. We keep parking by side of highway and tromping to go look at 'that beach', or 'that beach', or 'this beach'. We're in beachwear - flipflops, short shorts and tops. DD starts screaming something fierce and hopping around, getting louder with each jump. There was a dead (and open) mouse that she stepped on, and somehow, the mouse got caught between her foot and the strap of the flipflop, bouncing around as she screeched and leaped. We, or course, mom and younger sisters, and laughing hysterically. I had to pick her up to stop her long enough to get the shoe off and the mouse gone...
2) Girls have stomach flue. All night long. I'm carrying DD#1 from bedroom to bathroom, hoping we're going to make it in time, when I feel that we are NOT, in fact, going to make it in time. She has puked down my back, in my hair (long,a nd down to be waist), and it's sliding off my hair and onto the back of my leg, and dropping onto the carpet. At 2 in the morning. I am not pleased, and roust DH out of bed to "come help me, cuss it all to tarnation!". "But I made them barf buckets". "Yes, you did, but they're not using them...."
They puked all over the beds, each others pillows, the floor, me, the floor..........

I did laundry ALL the next day. The whole house stunk.