If you really want to have fun, bring your own bottle of wine and ask the restaurant to build a main course around it for you. (Well actually, if you really really want to have fun, ask for this and then hand them over a EUR. 3,99 bottle of Californian wine).

Any specific requests I have depend on the nature and quality of the restaurant I'm at. At a steaked grill house, I don't bother. My wishes are limited to 'medium please, no ketchup' and if they manage that I'll be quite happy. In a more upscale reastaurant, I might have more specific requests.