With mine it's milk rings.  Our's tear off with a zipping sound.  He
sure knows the sound and comes running from where ever he's hiding.

As I posted a while back, his twin brother licks every plastic bag he
can find!  Walmart bags, chip bags, sandwich bags,ect.  The little
freak looks me square in the eyes while he licks if I am within sight.

As posted... I wish I could ge into thier heads for a few minutes.
They seems to live in a bizarre world some days.

All three of them do this (not together!) suddenly pull their ears
back, growl the most fierce sound I have ever hear from a cat ,
actually more of a deep loud grunt!  Then suddenly run from one end of
the house to the other about 5 times.... then suddenly back to normal
like nothing happened.   I have read that it's sort of an 'imaginary
friend' thing.    Some days....lol

I attached a pic of them.... baglapper on the left and milkring on the
right.   (Spot n Spike actually)