Anything *is* possible, depending on the context.
   Can I fly crosslegged while touching my fingers? Sure - I can
   levitate.

   I could levitate in my mind.
   I could construct a picture *showing* me levitating and
   therefore, I levitated.
   I could get wires that lift me up to levitate.

   It only becomes a problem when "if and only if" is attached to
   the possible answers.

   Just the other day, I made a Vine telling people they could be
   anything. This girl wrote back, "Yeah, well I can't be a Unicorn
   for the rest of my life!"

   I said, "Sure you can. If you believe you're a Unicorn, you're a
   Unicorn. The people around you might not agree with you but
   that's their problem isn't it?"

   So, I'm saying the same thing as the above Meme, just in a more
   positive fashion. Since I believe that Delusion is _also_ the
   state of mind of the "Credible Proposition" person who made that
   graphic, I prefer to keep it positive. Otherwise people get
   cocky and actually believe they know something.