Just now in my work canteen they had a "Thai Pad Thai" which despite the double pointlessness of saying that a dish called Pad Thai and only from Thailand was Thai, it was actually completely different from what you would get in Thailand.

On a happier note, I recently had a taster course which started with a "Pisco Sour" which instead of a cocktail ended up being a nitro-frozen sorbet.

Fancy restaurants often like playing with familiar concepts. Occasionally they are successful, often they are not (especially the whole lazy "deconstruction" concept).