The only thing more dangerous to an evil genius than their oversized ego is bad timing.
Super villains always have strong motivators for capturing damsels, destroying cities, and creating an apocalypse. It’s important that the good guy understand their perspective. Even more important is revealing just how they created their weapons of mass explosion and how those weapons play into their evil plots.
They expect you to be fascinated, to congratulate them on their evil accomplishments, maybe even to change sides and join them on their crusade. But occasionally, evil geniuses are overcome with excitement, or perhaps pride, and let themselves get carried away with revealing their plot prematurely.
When this happens, it’s best to escape from the ropes and chains binding you to your chair. Sneak out quickly and quietly while their back is turned and they’re in the middle of an unnecessary monologue.
It’s probably not the first time someone has escaped from them. It’s really for the best. Good quality evil geniuses should be able to learn from their mistakes.