Probably not uncommon.
Work colleague has just come back from Canada a couple of weeks ago. He and his wife had a float plane tour from a town there (not Vancouver, although they did visit there too).
He had a video of the landing from inside the plane (DH Otter) - just before touchdown the picture jolted as the pilot swerved to avoid a boat headed straight across the landing point. Couple of seconds later you see the boat scooting across the side window having done a tight turn to avoid the plane, then the plane touched down on the wake and bounced a bit.
That scared him enough - I'll send him this video too, saying hey - it could have been worse!