:|
An anti-emoticon. Face with no emotion. While a person excepts you to do ":D", you can give ":|" instead, if the joke wasn't funny. Can also express that you are telling something seriously, although it sounds like a joke.
Person A: hey wassup?
Person B: The sky :|

Person A: My cat died because I put it in the microwave oven to dry it up
Person B: haha yea right
Person A: not a joke :|