I had three tin foil barbs for a bunch of years (R.I.O. Big Red and the
Gang) and those three would follow me around the room. God forbid, I
forgot
and put the can of food down near the tank. They'd sit staring at it for
days.

That's funny. I have a couple of bettas that know the difference between the
betta-flake can and the bloodworm jar. They practically jump out of the
water in excitement when I pick up the jar.

--
John Goulden