At the beginning of the strip the Cat is curious to what the Mouse is doing. Because he likes to think he can figure things out on his own, he hops off the wall for a closer inspection. The Cat has a bit of trouble getting back on the wall, because he is very unfit. I know it doesn't really register, but you have to admit, it is pretty amusing to watch him struggle! Also it eats up some time, so the strip fills out the minute nicely.
I hope everyone is enjoying their Monday off! See you next week!