I can totally relate motherof5boys1girl. It is very traumatizing!
When we first moved into our new house, we stopped at a house with a free kittens sign. Ended up taking 2 home. I set up a spot for them in our downstairs bathroom, which also has our washer and dryer in it. The kitten I chose was a black fluff ball and the kids had chosen an orange tiger striped one and named it Nemo. They were maybe 7 weeks old tops. I was doing laundry one morning and they had been sleeping in a ball on the floor on a blanket. I started the dryer and left the bathroom. For some reason, it hit me a few minutes later that I didn't stop to pet the kittens before I left the bathroom. My heart sank when I opened the door and only saw my little black kitten wandering around, somehow I just knew. I yanked open the dryer door, dug through the clothes and found little Nemo limp and gasping for air. I honestly had no clue he could even jump that high, let alone do it so quietly in the split seconds between me grabbing clothes from the washer. I ran him under cool water to try to lower his body temp and tried blowing air into his face while rubbing him. I sat there sobbing while he died in my hands. We buried him in the backyard and it still brings tears to my eyes when I think about it. The kids seemed to deal with it better than I have.
I have never gone through anything that horrible in my life. To this day I still feel awful and I wont start the dryer til I double check it twice and locate the younger cats. Theres lots of times I forget to start the dryer cause I go looking to make sure I can find them all and forget to go back. I hate doing laundry now and thankfully have 2 teenagers to help me out with it.