Event - When I was a kid we had the L.A. river behind my friend's house just over the fence. After school we would jump the gate and play in it. One time we made this cardboard boat about 4 feet wide and piled a bunch of leaves and branches on it, then set it on fire. We put it in the water and watched it go. It went into a tunnel and we could see smoke pouring out from everywhere. I think it got stuck. We ran away. About 20 minutes later we heard sirens. Not sure if there was a connection, but...
Apology - I'm sorry I was ever friends with that guy. He got me in soooooo much trouble!
