I'm not normally funny but I've been funny a few times in my life. It's how I got my last girlfriend. I don't think it's something you can learn, so much, you just have to be in the right headspace. Of course, for the most part, headspace is a lifelong thing. But I guess we have a little bit of flexibility. Not sure if everyone has the flexibility to suddenly be funny once in a while or if that's just me. Anyway, if it can happen once in a while I guess it could happen permanently. That would be harder or less likely though.