Dumbest argument you've had with your SO

So we are trying to be frugal and I gave my partner a grocery list to stick to and he came home and bought two additional items: sparkling water and a brick of cheese. So an argument starts and he says "well you like sparkling water and I thought we could use the cheese for cooking" so I counter back "if I wanted cheese I would've asked for cheese!" (I do all the cooking)... instead of being mad he bursts out laughing and of course I do too cuz it's a ridiculous argument.

Anyone else find themselves fighting over dumb things? Or maybe you or your SO has said something funny during an argument?