I'm particular about my morning coffee. I always have 170g of coffee to 15g of flavouring syrup. (I used to drink double that, but I'm trying to keep the stimulants down.) The ratio is important.

Every now and again (like this morning) I accidentally overshoot on the syrup and have to adjust the amount of coffee to compensate.

This means, I get extra coffee (yay!) but I have to do semi-complicated math before my morning coffee, which is a little annoying.