You are swimming on a beach in the surf. You leave your cooler and supplies on the beach, and after a half hour you swim back to shore, but your stuff isn't there. You look along the beach and see your cooler 200 m down the beach. How did that happen?
◦ You must have had too many and just lost track of where you were.
◦ You must have gotten caught in a rip current without knowing it.
◦ You must have been swimming parallel to the shore without thinking about it.
◦ You were affected by the longshore current and drifted with it along the coast.