"I should really get a move on, but it's just so nice here..."
The Lawn Gnome is quite happy to stand perfectly still and watch the world go by. As long as the view stays interesting and the weather isn't too bad, he'll stay in one place for years on end, not budging even an inch no matter what may happen around him.
This may lead you to mistakenly believe that the Lawn Gnome is merely a statue. But the joke's on you if you pick him up and carry him home to your front yard, because if you don't give him something interesting to look at, he'll pack up his fishing pole and pointy green hat and be off on his way!