Purchased a soft drink from a fast food restaurant. I have a few friends that, in their minds, it is never justified to buy a drink from a fast food place if you're doing takeout because "you have drinks at home, they charge $3 for something that costs them $0.11 to make, etc."
It's become somewhat of a debate amongst our group of friends: I argue they have flavors I may not have at home, it can be a treat, and it helps keep restaurants in business since drinks are where they make their money. I'm told it doesn't matter, the upcharge is too much to justify.
I've boiled my view on it to "There is a fine line between frugal and cheap." But never thought the purchase of a soft drink would be so polarizing amongst people in my life, hahaha.
There's also an ongoing moratorium on the board game Life simply because we cannot agree if it's legal for one player to take out all of the bank's loans on their first turn. It's not explicitly stated in the rules you can't, but many of us feel it defeats the spirit of the game.