"Finally, some help, bumpty-bumpty-bump! Here I was, just minding my own business, trying to make the big boom, big boom, bumpty-bump, when all of a sudden war breaks out! War, bumpty-bumpty-bump! Those pirates, they went away, but on the way out of the cove they sank the ship that was bringing me my gunpowder! I need it! I need it for the big big boom, bumpty-bump!
Anyway, I tried going down to Sonofa Beach to see if any of it washed up, bumpty-bump, but those lobsterfrogmen down there are too tough for me to handle.
You -- you go get it for me, bumpty-bumpty-bump? 5 barrels, at least."
If you have acquired at least one barrel of gunpowder, then the following will be added the preceding text:
"My gunpowder! Big boom! Big big boom! Thank you, bumpty-bumpty-bump! Bumpty-bump!"
He gazes at you thoughtfully for a few seconds, then a smile lights up his face and he says "My life... er... my bombs for you. My bombs for you, bumpty-bumpty-bump!"
The Lighthouse Keeper's eyes light up as he sees your gunpowder.
"Big boom! Big big boom! Give me those, bumpty-bump, and I'll make you the big boom!" He takes the gunpowder into a back room, and returns with an armload of big bombs.
The lighthouse keeper is a reference to the "Trashcan Man" from Stephen King's novel The Stand. The image of the keeper also resembles the character, who is played by Matt Frewer in the TV miniseries.