Things that are difficult to say when drunk:
1. Innovative
2. Preliminary
3. Proliferation
4. Cinnamon

Things that are very difficult to say when drunk:
1. Specificity
2. British Constitution
3. Passive-aggressive disorder

Things that are downright impossible to say when drunk:
1. Thanks, but I don't want to have sex.
2. Nope, no more beer for me.
3. Sorry, but you're not really my type.
4. Good evening, officer. Isn't it lovely out tonight?
5. Oh, I couldn't. No one wants to hear me sing.