Yesterday you needed to know about the double slit experiment, and today’s joke is entirely mysterious for those who’ve never heard of quantum tunnelling. I apologise. Don’t worry, this story line is now on hold for a while.

↓ Transcript
1. Photon is in prison...
2. --sigh
3. --clang! --eh?
4. --clang! clunk!
5. (hi! I'm Quantum) (I've tunnelled through) --but how?
6. (would you believe... I put the soil inside a vaulting horse?)