In a high school chemistry class, we had to use pipets to dispense 10mL of 2 things that react. My partner was convinced that the tip of the pipet contained 1mL while I knew better. Out pipets looked like this. She wanted to fill the pipet to the 9mL and dump everything in but I insisted on filling it to the 9mL, dispense to the 0mL mark, refilling another mL and dispensing it because I knew the tip didn't contain exactly 1mL. We argued for a while but then I realized if I followed her incorrect pipet usage(lets say the tip contains .5mL) and only dispensed 9.5mL of both chemicals, the result would be the same so I just agreed to her blasphemous incorrect pipet usage and said I was wrong just so we could get the lab done.

I'm pretty proud of that lie because 1. I put my pride aside and admitted I was wrong when I knew I was right and 2. got decent results despite having a partner that didn't know how to use a pipet properly.