I don't leave things behind,for me it's more leaving things in the water!
Knocked me glasses into the Tees at Dinsdale before I'd set up-blind without them.
Mobile phone went in,raked about and found it and thought it would work if I dried it out!
Brolly blew in at Renny last year,took ages to sink.
One for another thread maybe,my pet hate when fishing is using a brolly.