Rule #1 - Never eat in any restaurant that Revolves, Floats or is Otherwise not firmly located on, or within, 10 metres of ground level* - the most disappointing Margharita I have ever had:

"With a height of 368 meters, Berlin's television tower is the second highest structure in Europe - On clear days, in the steal-enclosed globe that makes up the tower's 203 meter high viewing platform, one can enjoy a spectacular panorama of the entire city and its environs. A special attraction of the television tower is the Tele Café, a revolving restaurant directly above the viewing platform. The 200-seat restaurant rotates on a circling disk - one full turn takes about half an hour.": http://www.berlin.de/stadttouren/en/alex_3.html

* = A paraphrase from an article in Obsessive Traveller ~David Dale Flamingo Paperback - March 26, 1992