One morning, I was having trouble with the waffle iron. Every time I opened it, the waffles would stick to both halves. I’d say bad words, dig the “waffles” out and fling them to the dog. He very quickly figured out that <beep beep beep> meant “incoming frisbee”.
After that, every time I’d get the waffle iron out and plug it in, when it did its startup beep, he’d show up like magic. (He was also known for appearing out of thin air every time I shredded cheese - he’d stand next to me and stare at the floor…)