Prepare spaghetti according to instructions on the box, drain
In a large skillet, heat butter and olive oil; add mushrooms; cook untill shrooms begin to soften
Add shrimp and garlic; cook until shrimp are opaque - that's not long at all!
Combine hot cooked spaghetti and shrimp and mushroom mixture, chopped dill and salt and pepper.
Toss to mix; Arrange on a warm serving platter, serve immediately.