Is there really a pot of gold at the end of the Rainbow?

Yes, but have you ever tried chasing the end of a rainbow to find where its end actually touches the ground?

its based on a JOKE----because the RAINBOW is an optical phenomenon representing  your viewing the rainy area and the light reflecting/bending at an angle of 57 or so degrees from your POV-------You approach the rainbow and it "moves" as your POV changes---- you NEVER CAN FIND OR GET TO THE END.  Because it is ALWAYS 57 degrees from your vantage point.

There is no end of a rainbow, if you don't believe me, try searching for it, the next time it's a sunny & showery day.

You can't outsmart a leprechaun

Yes there is but you've got to get there really fast before the leprechauns get it.

No, there is not. If you can't tell difference between real life and a fairy tale or fiction, you are delusional and need professional medical help. 

You cannot find the end of the rainbow.

You cant get to the end of the rainbow. That is part of the myth. And this is backed by physics.