Wordchain but you can only use animal names, in case you haven't played it before, the user above posts the name of an animal and then the user below has to name an animal that starts with the last letter of the last user's animal.
Eg:
User 1: Duck
User 2: Koala
User 3: ape
Let's start with octopus
Eg:
User 1: Duck
User 2: Koala
User 3: ape
Let's start with octopus