On another dive where I got a good dose of paranoia was a wreck dive off of North Myrtle beach in the Atlantic. The DM said there was a current and warned us to stay on the down line to the wreck in 50 ft of water, and not to leave the wreck under any circumstances. My buddy who was part of a father-son team was assigned to me because the son was blowing lunch from the moment we left the dock, through the dives, all the way back to the dock. I felt really sorry for him. The Dad had some trouble getting into his gear so they told me to go down to the 15 ft line and wait for him. After about, what seemed like 10 minutes, here comes a diver who wasn't the Dad. I thought, "OK, something happened to the Dad, so I've got a new buddy." My new buddy comes next to me and while grabbing the line gets his octo reg stuck in the corner of the 15 ft line and the line coming down from the boat. I thought to myself, "Oh great. What else can happen." I helped him free himself from the line and we ended up heading down but drifted off the down line. We found ourselves on the sandy bottom in about 5 ft of vis. My buddy is happily swimming along the bottom picking up sea shells with not a care in the world. I thought to myself, "This is not good. This...is....not....good. Now what?" I formed a picture in my mind of where the wreck should be relative to where we were. I tapped my buddy and gave him the turn around sign. We abruptly swam in the opposite direction for what seemed like too long of a time. All of a sudden there was the DM on top of the wreck directly in front of us. We finished the dive safely and came back to the boat. I asked the DM what happened to my original buddy and he said that they got the Dad in the water but because of the 3-4 ft seas he flipped and came back to the boat. So, they sent "happy-down-blueberry-lane" to me and you know the rest.