You mean to scare seals,
or to lure a killer whale
to an easy meal?
(When the PETA types
sue you, the lawyers will ask
this same question . . .)
Wasn't there a story some time back where some California do-gooders found an injured sealion pup, nursed it back to health, and with a deal of media attention, released it back into the wild offshore, only to record it being taken by a Great White, with a splash, a yip, and a burp, before the assembled masses?