What really annoys me is when I ask for a medium and am told that for twenty pence more I could have a large.

What I hate is having to scan the menu trying to find out if they have Small, Medium, and Large, or Small, Large, and Extra-Large, or Medium, Small, and Biggie, or Large, Biggie, and Extra-Biggie, or Medium, Extra-Medium, and Jumbo, or whatever. Not to mention that each individual restaurant can't even keep their sizes internally consistent, so that a Large Fries might be the medium size, but the Large soda might be the small.

Not to mention fast food joints that provide free refills, yet encourage you to order the large anyway. Greater price for the same amount of beverage.