Movies
Probably some local fisherman, out for a pleasure cruise, at night... in... eel-infested waters...
— Vizzini • The Princess Bride

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The proposed explanation becomes less convincing with every added detail. A pleasant fishing trip sounds ordinary until night and dangerous waters enter the picture. The pauses let the contradiction emerge piece by piece, undermining the reassurance that the opening 'probably' appears to offer.
Context reviewed