Family, work, familiarity. Listen, if I had a magic wand and I could make myself really be happy, I'd zap me onto a farm. And I know nothing about farming.
All you have in comedy, in general, is just going with your instincts. You can only hope that other people think that what you think is funny is funny. I don't have an answer but I just try to plough straight ahead.
Credulity is belief in slight evidence, with no evidence, or against evidence.