Heat a large, 12-inch skillet over medium-high heat. Add the olive oil and heat until it shimmers.
In a medium bowl toss the shrimp with the salt, pepper and red peper flakes.
Add to the skillet. Each piece should sit flat in the skillet, not touching, and untouched for 1-2 minutes.
Flip over using tongs. Let sit another 30 seconds to a minute before transferring to a plate. Shrimp is fully cooked when it is pink in color and no longer grey or opaque. You may need to do this in batches depending on how many shrimp you have. Once the tails start to curl, get them off the heat quickly.
Serve immediately with fresh lemon wedges, fresh parsley garnish and cocktail sauce for dipping.
A serving of shrimp is about 1/2 pound, or about 7-8 per person. If served as part of a main dish, such as with pasta alfredo, you'd probably want 5-6 per person and could get 5-6 servings.