I was Steelhead fishing near the mouth of a creek that flows into the Grand River today. I hear someone whistling to my left and I look and see someone coming toward me in what I thought was a kayak. As he gets closer I was pretty astonished to see him kneeling down on a blow up air mattress pushing his way toward the Grand River using a orange driveway marker as a "oar". When he gets a little closer I asked him if that was indeed a air mattress, he responds with "Yeah, it floats and it's something to do". I asked him where he planned on going and he says "Oh, probably down river a couple bridges away". I said "You're going to take that thing on the River?" and he simply says "It's something to do"?? He was wearing a pair of Jeans and a coat, no lifejacket or anything else that resembled a safety device. Last I checked before I left this morning the river was flowing pretty good too at around 2100cfs. He didn't seem high or crazy, to the naked eye anyways. There is a pic below I snapped as he floated past me, this is a SMALL air mattress too, no more than 2' wide. I told him he was NUTS and he just laughed it off and whistled a tune on his way. I saw a guy in the parking lot when I got back in and he asked me if I called 911. Bubba10, if you read this, did you see this guy in the parking lot? This was mabey 10 minutes after you left the spot we were fishing. And I'd also like to add that..... THE WATER IS REALLY COLD!