Of all the stories which we've come across on this list so far, this might have the strangest reasoning behind it. Miles Teller wasn't happy with the idea of kissing Shailene Woodley when they made 'The Spectacular Now' together, and he had excellent reasoning. Woodley's breath wasn't just bad; it positively stunk.
While it's never nice to laugh at someone who has a hygiene problem, in this case it was a problem entirely of Woodley's own making. As many young actors do, Woodley was going through an 'experimental diet' phase. The diet she'd chosen was called 're-wilding,' and focused on eating the same kinds of food that early indigenous hunter-gatherers once did. To that end, she was regularly consuming sachets of dirt and soil. Teller hated kissing her, and we don't blame him one bit. People are free to diet however they like in their own time, but don't inflict it on other people!