>Never be afraid to hide something wonderful in your code.

In your own code or in your employer's code?

Because having some engineer years down the line spend hours figuring out some mystery WTF code, jut to realize it was some undocumented easter egg of another engineer who left years ago, would piss everyone off.

Easter eggs had their place when engineering teams would basically stay the same and work on the same product for years, so it would be like an inside joke the whole team was in on, but when teams are constantly changing with people job-hopping all the time, easter eggs are liabilities.