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.