Drinks that Shouldn't Exist

Decaf coffee. 

Alcohol-free beer. 

Iced tea. 

They all remind me of the "jumbo shrimp" oxymoron, where the two parts shouldn't go together.  Coffee exists because of the caffeine content - removing it defeats the purpose.  Enjoying the taste of coffee is just acquired from drinking normal coffee.  As for alcohol-free beer, I thought the only reason people drank it was for the alcohol.  I can understand people enjoying trying different kinds and styles of wines, but alcohol-free beer is like driving in go carts, but being restricted to five miles per hour.  Iced tea is just leaf-flavored water. 

There are other things like this not related to drinks.  People can get used to a certain location or method of doing something, that when circumstances change, they are unable to be flexible, leaving them with unnecessary work.  Someone who likes having printed maps with them when driving may not be willing to use a GPS on their smartphone, for example, even if it may be less work. 

If you don't adapt to and realize changes around you, you might end up metaphorically drinking decaf coffee.