Relationship deal breakers -- we all have them to varying degrees. It seems that even celebrities have deal breakers. While a guest on Jimmy Fallon the other night, Gwen Stefani revealed that she almost ditched Blake Shelton because of a deal breaker. What could Blake do that could possibly warrant a deal breaker?

Roller coasters. Yep, that was almost the deal breaker for Gwen and Blake. “He won’t do the roller coasters. That was almost a deal breaker for me,” Stefani told Fallon. “He doesn’t fit in anything. We did go on Matterhorn …he did that one, but he barely fit inside the little thing.”

It was Blake's first trip to Disneyland and he refused to go on a roller coaster. Not because he was afraid (or at least that's what he claiming) but due to his height. He just doesn't fit.

Do you have a relationship deal breaker? What is it?