Bad Idea! If your trying to defrost them,just put them in a bowl in the sink and run water over them, if your trying to cook them,try frying them with butter and garlick.
There is no need to thaw frozen shrimp prior to boiling them. Have water at a rolling boil before adding shrimp, add shrimp a few at a time trying to keep the water boiling. Cook no longer than 5-10 minutes, just until turns pink.