I believe Happy will make the developer more productive.
If you are a software developer. You must know about TDD, Test-Driven Development. That will help you build a safe and bugless project.
Now the project is bugless, but the developer is not. So we need to make yourself more "healthy."
HDD is an attitude. You can use it everywhere you want.
Moving your seat far away from the PM or Boss, as far as you can.
By the way. Having your favorite drink on your desk is more helpful.
Please don't use "foo" or "bar." Using other words!
Don't use p1, v1, v2 as a variable. Please make it more friendly.
For example. "Gandalf" for CI system, "Houston" for your manager, "C4" for your computer.
Just change something and see any difference.
High five with a colleague next to you.
Gandalf: "You should not PASS !!"
Give it an emoji and say "well done."
Please don't just leave "WTF" and close it.
You can use emoji to show your feeling (like Trollface) and say "Nice job" but still close it.
Forcing your colleague who uses sublimeText or VScode to pair with you by vim.
"Houston, we have a problem."
Just help them update to Windows 10.
All my colleague, thanks to their patient with me.