I'd like to know why it is that so many people don't seem to have the sense/manners to KNOCK on a closed door that is between them and a toilet, especially considering that so many public restrooms don't have functional locks.

I'd also like to know why it is that I'd want to take an allergy medicine whose side effects might include headache, sore throat, nosebleeds, and colds. Don't people take allergy medicine to get rid of those things?

And why hasn't dentistry evolved to the point where they can clean your teeth with something other than a sharp pointed hook?