Some years ago, I was assisting at an Organ recital on new year's eve at my city's main church, the last piece was supposed to be Elgar's pomp & circumstance march no.1, arranged for two organs.
We programmed all the combinations for that one and all the other pieces on the day before(there were lots and lots).
Fast forward to the end of the recital, I take away the sheet music for the penultimate piece and activate the first combination for the march. The organist raises his hands and starts playing -- and all we hear is a principal 8' only, completely wrong sound. Somehow, all prepared combinations had disappeared! He managed to perform the piece somehow, but the recital's supposed climax ended a bit underwhelming.
Sadly, we never found out, why the combinations vanished (most likely, they were saved to another bank and we didn't notice, or somebody else switched banks/erased them accidentally, before the recital started).
Nerve-wracking indeed :(
Opposite happened to me. There’d been a performance of the Messiah in our church on Saturday night. I played for the main Communion service the next morning and everything was fine until the (quiet) Agnus Dei setting. Punched the General as per usual, started to play, and the Solo Posaune blared out. I almost fell off the bench with shock.
IMX cows (they are all domestic, locally) treat anyone with thumbs as a potential source of food.
They like licking hands and under-the-chin or cheek scritches; move slowly and talk, and if they're skeptical try crouching to make yourself smaller. (but don't make mothers suspect you're after their calves!)