Colleague A was using a small device to make labels.

The amount was quite a lot.

While Colleague A still had like 20 more to go, Colleague B asked "Can I use? I only have 5, I wanna go home early"

So me, being busy body, turned my head to Colleague B:

"When you buy burgers at McDonald's, do you also ask if the fella in front of you, whether is he/she buying 5 sets, and that you are only buying 1?"

Colleague B rested the case.