This splash happened to me in a Porta-potty once at an outdoor concert. I just automatically assumed I had contracted AIDS, herpes, and hepatitis at that very moment. Luckily I'm still alive 3 years later to talk about it.
<sigh> amateurs
Proper public bowl technique:
Wipe lid with TP to remove anything disgusting, flush.
Wipe again, put in toilet, but don't flush. This cleans up any water from previous flush AND minimizes/eliminates the splash factor.
Build 3-4 strip nest, occasionally 5 if the space in the front is covered with piss or the stray Indian pubic hair.
Put a strip down on the floor in front - this is often overlooked. This is what you drop you pants onto, and is often a disgusting spot for those abosolute beta pussies who piss standing up in the stalls instead of the urinal. These are the kind of people who shower in the gym in underwear or shorts, and change under a towel. They are often regulated to lower, mid range spots on the corporate ladder, and marry ugly wives.
Flush.
If it is a porta potty, wad up half a roll of TP and drop. This will block the yecch, and give your poop a splash free, soft landing spot, as well as showcase it for the next loser.