Mistake by a newbie
The worst feeling in the world is when you try to impress someone with your knowledge of a subject only to find out that you are woefully underqualified.
Uninvited advice on kicking technique was supplied to a gym member by a six-month-old rookie martial artist. It seemed as if she were an established specialist with more than a decade of knowledge and expertise. To make matters worse, he tripped while presenting the method. Ouch.