...Santa.
It sounds stupid mainly because this is a chance for terrorists to shoot missiles at us while we're tracking a guy with reindeer. Apparently Rudolph's nose is hot enough to be tracked the same way the government tracks missiles, so the US government tracks down Santa on Christmas Eve since 1955.
Are you brain dead? They aren't tracking
anything. The NORAD radar is still searching for hostile targets.
The "tracking santa" website probably doesn't even use one radar installation.
And it's not like NORAD can only track one thing at a time.