Worked on something very similar recently at work.

If you want to respect more of Excels formatting, like multi column cells, you can get the text/html from the paste event instead of the text/plain.

You can parse the HTML using DOMParser: parseFromString()

There's a version of "Never Gonna Give You Up" in ASCII art. Which means if you can access a .bashrc or something similar, you can rick roll them in their terminal on startup.

Found it: https://github.com/keroserene/rickrollrc

I love that. You’re never safe from Mr. Astley