Minecraft wiki entry for Boat, associated text: Sand, red sand, concrete powder, gravel, anvils, and dragon eggs drop as items when they fall onto a boat that is in water.
A chest is short enough that a boat falls onto it rather than crashes into it.
In Legacy Console Edition, holding the movement stick to the side in a boat on blue ice causes the player to spin quickly. If a passenger is in the boat while this occurs, when the player exits the boat after it reaches maximum velocity (attained after about three seconds), for most mobs, the mob's head may spin uncontrollably. For some mobs, however, nothing happens (such as slimes and ghasts). The mob may also get its head stuck at an angle. Thorough testing was done on Minecraft: Wii U Edition, although the glitch was originally discovered on the Xbox 360 Edition.