Dr Pepper had its origins in the early 1900s as a patent remedy for constipation. The old labels used to display a clock face with 10, 2, and 4 in bold print. Those were the times of day you were supposed to imbibe in order to stay regular.

Now I like Dr Pepper, but the flavor that many people object to in it is associated with its supposed anti-constipation properties....prune juice.