A tap on the shoulder...

I turn and look, it's Rusty. Who then "Meowed" at me and looked to the kitchen.

I glanced at the clock and saw that it was 5:55pm

Since he was so polite about it, I fed them 5 minutes early.

Usually both cats are yelling "it's dinner time" from 4pm onward and racing to the kitchen anytime you more even vaguely in that direction.