Just googled "bouncing bomb", and via good old Wikipedia (where would we be without it!) got hold of this...
"Twenty-five inert Highballs, renamed "Speedee" bombs, were also sent for use in the USAAF trials. Drop tests were carried out over Choctawhatchee Bay near Eglin Field, Florida, but the programme was abandoned after the bomb bounced back at A-26C-25-DT Invader 43-22644 on Water Range 60, causing loss of the rear fuselage and a fatal crash on 28 April 1945"