The "sane" / "normal" response is often to keep dwelling and continue feeling negative emotions. Eg. anger and resentment because your shitty parent died without ever apologising or admitting their mistakes.
If you felt something like that for a moment before you snapped out of it and took a step back to see things from the funny perspective and laugh your ass off then I can relate. It's one of the ways I deal with negative emotions. Forcing yourself to think about something from the "wrong"/loony perspective. Sort of a healthy, simulated craziness.
If you didn't experience anything like that and just burst out laughing straight away then I guess you're crazy, but not necessarily in an unhealthy way.
It's still a respectable way of handling the absurdity of life.