Out at sea, kid #1 asks kid #2 if he's going to wear that sissy thing. Kid #2 explains that it's called a life jacket. Kid #1 says he doesn't need one.
Kid #3 then swings the sail around, which hits kid #1 and knocks him into the water. As he flails around and begs for help, Seaspray shows up.
Seaspray rescues kid #1 and puts him back on the boat. Seaspray tells him he guesses he knows he should have worn a life jacket -accidents can happen, and a life jacket's good protection. Kid #3 says they're like seatbelts in a car, whilst kid #2 compares them to a motorcycle helmet.
Kid #1 says now he knows, and as Seaspray puts a life jacket on him, he says that knowing is half the battle. Seaspray then transforms and heads off.
NOTES
In the show, Seaspray was voiced by Alan Oppenheimer, but for this PSA, voice director Wally Burr voiced Seaspray.