I HATE automatic toilets!
One place that I worked had ones that were very sensitive, fast, and over pressurized. A REALLY bad combination!
If you weren't careful, it would flush when your ass was about an inch above the toilet bowl. It would do this at the beginning of your shitting process which would give you a douching.
What was worse was at the end, you couldn't stand up and step away from it fast enough because your pants were around your ankles. You took a chance of getting brown water shot all over your legs and/or trousers.
Worse yet is that maintenance didn't see this as a problem and/or couldn't fix it. We took to putting duct tape over the sensor!