Fishing

My friend and me were out on the lake in a rented boat fishing and we were catching our limit of fish. When we got read to leave and while I was pulling up the anchor my friend fished into his tackle box, got a magic marker and put a big X on the side of the boat. I asked "What are you doing?" He said he was marking the spot where we caught our limit. I said "That won't work!" and he said "Why?" And I said "Because the next time we come out here we may not get the same boat!"