Once you send a cleaner or security something either foods or anything, they are rendering a service for you & N1K as tip is not a gift but thank you for assisting me.
If you can't tip, leave your desk & go & buy your foods.
In some corporate settings, sending domestic staff errands are prohibited ๐ซ
My dominant foot had always been my right until SS3 first term, when I injured my right knee badly in school team training few weeks to the tournament. I was through on goal in a 50-50 situation with the keeper, I got to the ball first, but he caught my knee. It gots interesting.