I was on my first cross-country motorcycle trip back in the 70s, travelling solo, and was pulling into a restaurant parking lot where a number of cyclists and vacationers were gathered. I felt really "cool", dressed for the part, a thousand miles from home, and with my BMW all set up and packed for touring & camping.
As I pulled into a parking space, I was aware of all the eyes checking me out. I slowed to a stop, turned off the engine, swung my leg over the seat, let go of the bars, and then realized too late that I had forgotten to put down the side-stand!