19

In high school, I took Animal Behavior one term and had a big clever white rat with red eyes I named Harvey.  Harvey spent some time in the Skinner box and under my tutelage learned an elaborate pattern involving pressing the bar and turning around and pressing the bar again (then there would be a pellet) Hooray!  Before the final presentation though, I got bronchitis and missed a week of school and by the time I came back the rat had died.