The Lock Up
About a 10-minute walk from the station, the Lock Up is a jail-themed izakaya restaurant. You did read that correctly! First, the izakaya is like a Japanese version of a pub--you can get small plates of grub to share with friends, and drinks, all in a lively atmopshere. But this is a step beyond, as you'll quickly realize when you walk through the maze filled with booby traps upon first entering. Once you finally make it (if you dare, muahaha) to the hostess (dressed in a miniskirt), you can expect the handcuffs to come out, go on your wrist and to be "led" to your table.
The fun doesn't stop at the table. Be prepared for "visitors" in the shape of escapees (or worse) to roam through the restaurant. I don't want to spoil all the fun, but all I can say is, if you frighten easy, you might want to skip this place because even though your table is in its own individual holding "cell," the bad guys can still reach through the bars.
Drink and food names continue the theme, with brightly colored liquids served from a syringe and foods taking on ghastly names. This is fun you won't find in most pubs in the Western world. Part haunted house, part prison, all crazy. Even if you're not hungry, this isn't really about the food--it's about the atmosphere.
33-1 Udagawa-cho (just off Center-gai, Shibuya Grand Tokyo Building B2F)