Place it at the exact frame where a hand reaches for your prized item, after a short reaction gasp and before a record scratch freeze. Follow it with a comedic fail sound if the grab succeeds, or a victory sting when you keep hold of it.
About this sound
This clip is Gollum hissing his famous line in Italian, 'Il mio tesoro,' stretched on the S for comic greed, lasting just under six seconds. The raspy, obsessed delivery makes it feel possessively funny and slightly unhinged, perfect for claiming something as yours and refusing to let anyone else near it at all.