In the 1920s and '30s at the Grand Hotel les Bains in St. Moritz, Switzerland, they had the right idea: serve drinks on its ice terrace by skating waiters. It took some practice getting the rest of the staff serve cocktails successfully. For some clients, waiting for servers take a spectacular fall while balancing expensive booze on a tray was obviously half the fun. German photographer Alfred Eisenstaedt, who was then on staff for LIFE magazine, captured the Grand Hotel servers on film…