I really shouldn't go on flights anymore. I am starting to think it's me

Just before a short flight the plane stopped on the runway because of a "mechanical issue." They turned the plane around and went back to the gate.

I was sitting near the front and could hear everything that was going on. There was a mechanic outside who was talking to the pilot. He took a wrench and banged! on something a few times and said, "Is the light off yet?" The pilot yelled back, "No."
Bang, bang, bang.
"How about now?"
"Yep. Good to go!"

Five minutes later we were in the air and I was wishing I could unhear that conversation.