My friend bought a guinea pig from the pet shop: white, brown and black. It was the cutest and cuddliest animal I had ever seen. We would play with the guinea pig and let it walk around the room, exploring the known world and occasionally venturing into the unknown - outside in the corridor.
One day my friend decided to try something new: put the guinea pig in my trouser leg. The little pet revelled in this project. It started from the bottom and took almost a minute, burrowing its way up to the other side. I have never been tickled so much since then.