I keep a small pad of Post-It notes in my bag all the time. I found that when I was taking my DNiece to the washroom, she would get startled by the toilet when it flushed under her. She would jump off mid stream and then need to use her fresh pair of clothes. So I cover the "Eye" with a post it so it won't flush when she is sitting on the toilet. It also comes in handy to cover the "eye" on the auto sinks as well. You can keep the water running hiding the "eye".
We took DD-then-3 (now DD12) to the World when I was 7-1/2 months pregnant. We were at the airport early, early in the morning, so of course I was doubly slow (physically and mentally!

). Of course DFW airport has the auto toilets. The handicapped stall wasn't available, so I had to cram my enormous body into a regular stall w/ the 3 year old. I put the seat cover on the potty, pulled down her shorts, and just as I was lowering her, the darned thing flushed, taking the seat cover down the drain.
So, I set DD3 down & stand up (wouldn't be worth mentioning the standing up part, except that I was so very pregnant) to get another seat cover. I put that seat cover on the potty, turn to pick up the 3yr old, only to find that she'd pulled her shorts back up. Before I can get them back down--you guessed it! FLUSH!!!!
Now, if it had just been me, I'd have blown off the stupid seat cover. I'm a germaphobe about things we touch with our hands, but not so much things we touch with the backs of our legs. But not so Daddy, and DD3 would have run right out to him and told on me. So here we go again....
I could pretty much just cut&paste the last couple of paragraphs, 'coz the scene repeated itself several more times. Now, ya' gotta imagine all 200-plus pounds of me squatting down & up over and over again in that teeny stall. Finally, I was laughing so hard I couldn't breath & had tears running down my face. DD didn't know what to think, so she starts bawling, and I can't talk or compose myself enough to reassure her.
Yep. We finally blew off the seat cover. And yep, she told Daddy the whole story. And yep, I threatened to deck him if he gave me one bit of flack over the seat cover (just kidding. I'd never deck my DH--he's too cute)!