Here is a funny thing I heard:
" The son has a vacation and comes home from college. He finds his father chopping wood for the winter.
-Hey son, good to see you... why the long face?
-Hey dad, nothing, it's just that I found out in my philosophy class that the world around us does not exist , and it's all an illusion of our senses, and we are nothing but energy traveling through the dark cosmos at infinite speed.
-... oh that's nonsense, cheer up, help me finish this firewood.
- What's the point, this wood doesn't exist, you and me don't exist, it's useless.
-...

Now listen here you ingrate moron. From the day you were born, I raised you, I fed you, I wiped your butt and stood all your crying, and now you come here all mopey saying we don't exist ?!!! Start chopping firewood before I stuck my foot up your ***.

"