We've seen what happens when you change someone's autocorrect settings to pull a hilarious prank. But do yourself a favor and change those settings to do something productive instead.
As seen on Reddit, the idea behind this hack is to create a shortcut for words you often type. Just go to Settings, hit "General," find "Keyboard," and scroll down to where it says "Shortcuts." Then, create your own using letters and symbols. Try it for your email address (like in this case) or when you're sick of writing supercalifragilisticexpialidocious all the time.
Source: Reddit user SamF1sh via Imgur