I supervise the box office of a concert venue. This one show we had, the promoter held the entire front row for $500 front row meet & greet packages. Unfortunately, these packages didn't sell well and the promoter didn't cut off meet and greet packages sales and open the unsold tickets to be purchased at the normal top ticket price until the day of the show. This resulted in 3/4 of the front row being unsold 3 hours before the show.
Some customers who already purchased top priced tickets but weren't in the front row noticed the front row came available and called or walked up to the wicket asking for exchanges. My staff and I gave them all free upgrades without hesitation because nobody was going buy these tickets at that point and 3/4 of the front row sitting empty would just be dumb.
The next day I get an email from my uncle asking me if I worked the show the night before and gave a woman a free upgrade into the front row. I say yes and he tells me that person was friend of his and they were raving to him about how it was the best customer service they had ever received and that they were a box office manager for 20 years and would have never done that themselves.
The other one I remember was in grade 10 math. The teacher had an absolutely gigantic equation on the blackboard at the start of class and as an oral exercise the class spent probably 15-20 minutes slowly working through simplifying the equation until it got down to something like y=(x-5)/3. The teacher points to the starting equation and asks "what is Y if X is -5?"
The whole class is furiously scribbling in their notebooks and I'm just sitting there looking around at the class for a few seconds thinking to myself "how does nobody else see this?" I raise my hand to 1/2 the class making "how the hell have you solved that already?" groans and I say -10/3.
Teacher says I'm right, don't use this, use that. Point of the lesson is: Simplify your equations before solving them. One classmate turns around, looks at me and says "wow you are so smart".