You may or may not have seen the
news story , about the June 2nd launch of the Space Shuttle Discovery, doing "unprecedented damage" to the launch pad.
This picture was supposedly taken by an amateur photographer/tourist, but it looks like it was taken from a position a lot closer than they allow tourists, to me.
Anyway, it clearly shows the debris (pieces of brick and concrete), from the flame trench, raining down on the water.
photo credit ~ Ben Cooper/Spaceflight Now