Uncomfortable

Once they asked Petr Afonasyevich what kind of mattress he sleeps on, hard or soft.

- I sleep on the floor," replied Pyotr Afonasyevich.

- But it's uncomfortable, isn't it? - the questioners suggested.

- Uncomfortable? - Mr. Fakofsky was surprised, and continued:

- At one point in creation there are creatures that have eyes located on their heels, now that's really uncomfortable.

- Oh! How did that happen?

- Heel eyes? They started out as clawing, and now they've evolved.