@catsalad don't forget about NaN.

@catsalad As someone who has recently been plagued by issues trying to manage character set conversions from windows-1252 to utf-8, I deeply resent this

@catsalad I still don’t get how a Euro claims trademark on SO much stuff…

a€™

@catsalad undefined, null, and the like can also go a long way. Always test the limits of a form in front of you.
Tracking identifiers also can be fun, remember: URLs can have emojis too.

@catsalad you devil

@catsalad "undefined is not a function" for extra points

@catsalad also sometimes make sure that your data mojibake is a valid decode in a *different* encoding set so you can confuse automated tooling even more!

@catsalad 👀