[strela]

The basic idea is sound. I would offer one refinement though - sprinkle a little of this on the fries before throwing them down.

You get the extra-added bonus of an instant swarm of yellowjackets in addition to the seagull poop. We used to put the stuff in people's cars in high school then leave their window open just enough for the critters to fly inside.

"I suddenly remembered my Charlemagne: 'Let my armies be the rocks and the trees and the birds in the sky.'" Henry Jones Jr.

[Happy2BMe]

You may be onto yet another effective approach to the problem away from the beach (e.g., San Francisco, NYC, etc.)

Catches "Queens" and "Workers" . .