The Rubens restaurant on Leuven's market square billed the extra charge as "electricity". The woman customer was so surprised that she posted a photo of the bill on the microblogging website Twitter.
Gerrit Budts of Horeca Flanders: "It's permitted, if the extra charge is listed somewhere or the customer is informed verbally. However, it is not normal practice. In most establishments this will be included in the normal service that is provided free of charge."
Many Belgian pubs and restaurants will charge for a visit to the loo, to deter people from using the facilities without getting a drink. This charge is usually advertised. Horeca Flanders advises customers disputing an extra charge to take the matter up with the landlord or proprietor.
The post attracted widespread condemnation from micro bloggers, but the Rubens Tavern shied away from responding.