Measure up your pothole so you can fill it with red hot lava
Find some lava. Don't worry, you don't need to go near any volcanoes! Find a photograph of lava online and print it on a sheet of paper bigger than you need. Then cut it to the right shape to fill the pothole.
Fill your pothole with lava by dropping in your cut-out lava picture
Show it off! People will think they can see into the centre of the earth!