I'm soo with you on the "Cosmic Jokers"!
I hear so many experiences from people about their "guides" and how they have a sense of humour and play tricks on them. If I were an OPI I'd be tempted to mess around with ignorant species myself.
I've come to the conclusion that (your description) OPIs are entertaining themselves at our expense. That doesn't necessarily account for all experiences. We cannot discount the personal encounters of the benevolent and malenevolent beings.