Cold Fish

I had a piece of fried salmon in my fridge, a leftover from the dinner last night. I wanted to heat some of it in a microwave oven, and took a piece to a saucer with a fork. Then I put the saucer in the oven. Soon, the fish was ready and I started to eat. The fish was cold, not warm, and for a second I suspected if I warmed it at all? After a second I understood: there was a bit of cold fish left in the fork when I used it to take the fish to the saucer, and tasting this piece made me think the whole fish was not heated at all.