Why do few people find dark humor funny?

At times (not too often) I like playing pranks on friends and relatives. However, I tend to mainly include dark humor on it.

Examples of what my pranks woud look like:
- Called and pretended I've been stabbed during a robbery. Then let them find me bloody. ''Gotcha, it's a prank''.
- I just cheated with your best friend and well I think I'm pregnant. ''Gotcha, it's a prank''. Though I haven't done that prank yet.
- The one I played last year, faking coughing and pretending to have Covid. ''Gotcha, it's a prank''.

Why do few people find dark humor funny?
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