imagine my delight when I started to notice every time I whistled a song, my cat would appear. And then I did it on purpose to test my theory, and indeed my cat who loves being alone & hiding, would come to me every time I whistled.
I have a cat that startles easily, so I started to click my tongue to warn her of my incoming pets if she's not looking. Now I can mace that noise and she perks up in excitement for the incoming love
There's a stray cat around my apartment that doesn't even need the special sound. Dude comes outta nowhere as soon as he knows I'm around and climbs up my leg to get pets.