If you thought restaurants are just for eating, think again. People say they go to restaurants for something more than just food: fun. This is the reason so many "themed restaurants" came up, and most of them are a hit. But how different can themes be? Here is a list of some themed restaurants that I found to be pretty out of ordinary.
The Clinic

Image credit: Designboom
Location: Aurum, Singapore
The clinic is a hospital-themed restaurant in Singapore. Here the waiters are dressed in white coats like nurses and can be seen serving colourful pills and syringes of cocktails with names like "Nitro-Sangria" and "Sex on a Drip" to wheel chair-ridden customers. Here the plates are surgical pans designed in the shape of kidneys and rooms are in the shape of wards. For dessert you can ask them to put you on an IV.
Dinner in the Sky

Images credit: Dinnerinthesky
Location: Brussels, Belgium
Dinner in the sky is hosted at a table suspended in air at a height of 50 metres above ground by a team of professionals. It gives you a thrilling experience as you can have your breakfast, lunch, dinner, cocktails etc in the sky. Although it is presently located in Belgium it can be driven to any destination in the world.
Bytes

Images credit: Selfserviceworld.com
Location: Canterbury, UK
Here 15-inch touch screens are mounted beside the tables for placing orders. The software enables the drink orders to go to the bar and the food orders to the kitchen. After placing the order the screen offers free games like trivia, solitaire etc.
Toilet Restaurant

Image credit: Shenzhenparty.com
Location: Shenzhen, China
The hotel resembles a bathroom. Dining seats are replaced by toilet seats, and the food is served in toilet bowls and miniature bathtubs.
Le Spirite Lounge

Image credit: Flickr
Location: Montreal, Canada
Le Spirite Lounge is a vegan restaurant. This is special for its weird rules like you get your dessert only if you finish your meal. If you do not finish the dessert you can never go back there.
The Jail

Image credit: Funfever
Location: Taipei, Taiwan
The jail exactly looks like a jail with rusty iron and wooden bars and sliding prison bars. The waiters/ waitresses are dressed like cops. They hand cuff the customers and lead them to their cells where they can be seated in normal dining tables.
Snow Castle

Image credit: News
Location: Kemi, Finland
Snow castle is open from 10 am to 7 pm. You can enjoy delicious meals, sip your drinks and eat desserts, all at -5°C. But you must make advanced reservation for this restaurant.
Observatory Restaurant

Image credit: Aloeridgehotel
Location: Johannesburg, South Africa
The observatory restaurant has two telescopes, a 25" (62cm) and a 16" (40 cm). Visitors are allowed to look through these telescopes. The first 25" telescope can be used before and during the various courses of food ordered and the second one can be used during and after the desserts.
Robot Kitchen

Image credit: Robots-dreams
Location: Hong Kong
There are two robots in Robot Kitchen restaurant one for taking orders from the customers and another for delivering. With the sensors including audio, video devices, these robots can even respond to small commands if spoken in Cantonese.
Clematis


Images credit: Jaixa-imaging
Location: Visby, Sweden
Clematis conducts medieval weeks during the spring, autumn and winter. Here you can enjoy medieval jesters, musicians, fire-eaters along with the medieval food and go back to the Middle Age.