Because this is something Japanese kids apparently want, Burger King Japan is now offering all-you-can-eat whoppers with the purchase of any large whopper combo for ¥1000 (or about $10 USD).
From November 15 through December 1, the "B"iKing promo (which takes its name from a Japanese corruption of the word "Viking," a term used for buffets) does come with its limits, though. For starters, you have to finish your first burger before going back for seconds, you can't take any unfinished burgers to go or give them away to friends or strangers, and you must complete the whole mini-feast within 30 minutes. Oh, and it's only between the hours of 2:00 and 11:00 p.m.
Still, a regular Whopper combo is already $8, so just eating one extra burger should make the whole affair worth the trouble. Challenge accepted?