In Return Of The Jedi, during the battle over the Sarlacc, Luke is fighting some goons with his lightsaber on the sail barge or another skiff (I can't remember). Boba Fett is standing on a skiff aiming his wrist-mounted rocket launcher at Luke and Han Solo is lying unconscious behind him. Han Solo yells
"Boat attack? Boat attack, where?"
and gets up while holding a plank and accidentally hits Boba Fett, turning on his jetpack, which throws him in the pit, incapacitating him.
Where was this attacking skiff and who informed him of it? It is kind of weird that he said that even though no skiff attacked Han Solo's skiff.