Something that would be able to
coNverT WeiRD caPS -> Convert Weird Caps
Welp found it. Read the docs.
The formulas are
=upper()
=lower()
=proper()
There is also this answer if you need something fancy because the cells will be overwritten. Convert all text to UPPERCASE in a Google Spreadsheet
But the formulas work great.
In the case Joshua Dance's answer above isn't clear enough,
=proper(
. (Yes, without the close-parenthesis)