Extending your middle finger and index finger, make the sign for funny by using these two fingers together to brush off your nose. Remember the sign for funny by thinking you have some cream on your nose and you are brushing it off, which is funny.
If you have a giggler, funny is a great sign to make whenever they giggle. "That is funny!"
Remember, emotion counts for a lot when presenting this kind of sign. So be jovial and laugh or giggle when teaching your baby this sign.