This template warns other editors that they are in userspace and probably shouldn't be editing the page they're looking at unless they have a very good reason.
Usage: {{User:Skysmurf/Templates/PawsOff|user}}
Hint: the user parameter could contain something like user {{User0|Skysmurf}}.
Examples:
{{User:Skysmurf/Templates/PawsOff | user {{User0|Skysmurf}}}}
produces
This page is in the userspace of user Skysmurf (talk). Please do not edit this page unless you have a very good reason for doing so. Thank you.
{{User:Skysmurf/Templates/PawsOff | [[Elvis]]}}
produces
This page is in the userspace of Elvis. Please do not edit this page unless you have a very good reason for doing so. Thank you.