Trapped Then Born

The joke plays on the idea of being 'trapped' in the wrong body, which is a common way some people describe gender dysphoria. However, it twists the expectation by saying 'then I was born' which can be seen as the moment the person's true gender and physical body align, rather than 'transitioning' into a different gender. It's a bit of a clever wordplay that makes you think about gender identity and how people can experience it.