This happened when I used to be Pentecostal and attended a Pentecostal church.
Mother and I were to sing a duet. She could not find her note, so we had several false starts. Unwisely, I tried singing her note, but that just sent her on a warbling search into the wild blue yonder for her note. I started giggling. I thought, "G-d's gonna get me for that!"
Finally, she found her note and we finished the song. I was still thinking, as we left the podium, "G-d's gonna get me for that!" I thought surely I would, then, fall down the three steps. I didn't. I thought I would trip on the carpet at the altar. I didn't. I thought, "Ah! Home free!"
And as soon as I thought that and stepped on the tiled aisle between the seating arrangment, my feet flew out from under me! I thought I hovered, flat, in the air for a moment, then I crashed flat on my back!
Landing, I burst into unglorious, loud laughter at the whole situation and realized that many in the congregation were laughing -- out loud, little snickers, snorting, and every other imaginable type of laughter! And the usher was notably loudest!
I finally settled down and began to try to get up, when an extremely beautiful old lady leaned toward me and whispered loudly, "Are you all right, dear?"
And the whole thing struck me all over again, sending me back to the floor in renewed gales of laughter.
Finally, I was able to get up and find my seat, but I kept thinking, "I am getting married here in a couple months: will I repeat this then?"
Sorry -- it didn't happen at the wedding. But if it had, that would have made the story twice as fun!!