That time I had to explain shutter lag during a toast...
At my buddy's wedding, his uncle shoved an old film camera into my hands during the speeches. He thought since I fix cameras, I could make it work right then... I had to quietly point out the shutter was stuck open, which is why all his photos were blurry. We had a good laugh about it later, and I showed him how to check for that issue. It reminded me how often people don't know the basics of their gear.