My mother doesn't want me to drink out of the bottle. (Milk jug juice bottle etc)
Now, you may be saying "Well that makes sense" no, it doesn't the only time I would ever do that is if the jug is almost empty so I don't have to dirty a glass.
Discuss logic failures.
Okay let's discuss some logic, logic failures.
What if you or someone in your family has herpes and you or they just so happened to drink from the bottle? Anyone who else drinks from the bottle will get the same herpes.
This of course is an example, I can also refer to colds, viruses, other STDs, etc.