BOOM!
my chemistry teacher used to go sea fishing with sodium wrapped up in bits of bread. When the seagulls inevitably pissed him off, throw a bit up, and wait for the odd seagull to very rapidly and briefly turn spherical.
(
Mr.Ons knows you can hear him, Earthmen.,
Wed 1 Aug 2007, 19:05,
archived)
Alka Seltzer accomplishes much the same thing
Only slower, as gulls are so well mannered, they can't burp.
(
Heffrey wants to show you his wood at SmileMoon.etsy.com,
Wed 1 Aug 2007, 19:11,
archived)