I know it can be boring, but take advantage of the situation and rake in those blinds if possible. If there is another player at the table that doesn't know how to play a "Sitter Table" you can take their chips too.. Or.. other times I am friendly feeling and ask the other non-sitter(s) if they want to alternate taking the table blinds until the sitters are gone.. Once most of the sitters are out and some real players are there agree to start playing normally..
Of course, this only works with someone who is willing and isn't trying to "trick" you.. I've been lucky so far and have had several people work with me..
What really bugs me is when You are the only live player at a table for 30 minutes or better and some "Sitter" finally decides to show up and starts playing like a maniac.

After patiently and boringly collecting blinds for 30 minutes, I have built up a grudge against sitters and tried to aggressively impose my will..only to be knocked out soon after....

Can you say "TILT?".....