A restaurant in Japan is leaving customers a bit slaphappy.

Patrons at an eatery called Shachihoko-ya in Nagoya, Japan, can pay waitresses to slap them in the face, as revealed in a hilarious video.

For the price of 300 Japanese Yen (about $2 USD), Kimono-wearing, stone-faced women will slap the eager customer’s cheeks with a palm over and over again — and some even administer backhanded slaps.

Waitresses sometimes strike the diners so hard that they’re knocked out of their seats.

One man was even wheeled out before a line of the patron-striking waitresses, who bowed before taking turns clipping him around the ear.

Both men and women — locals and tourists alike — enjoy the slaps so much that they thank their assailants for the violent service.

Shachihoko-ya first opened in 2012 but was in danger of closing, which was when the wacky custom was introduced.

After staff started the stunt, business began to thrive — and even become so popular that more female waitresses needed to be hired to meet demand.

There’s just one condition: the waitresses must be female.

However, if a customer wants to request a specific waitress to slap them silly, they must pay a surcharge of JPY 500 ($3.40 USD).