Nunca entiendes!

So I don't know why this was so funny, but it's probably just one of those you-had-to-be-there situations or you-have-to-understand-that-person situation. But tonight I was washing the dishes and Francisco (my brother) was saying something to me. I said, "Como?" (Which means "what?") and he said, "NUNCA entiendes!" (Translation: you NEVER understand!) Of course he was totally kidding, but for some reason it was so ironically hilarious that I couldn't stop laughing.