This joke is funny because the children are attempting to imply that another child has been launched high into the air by the seesaw to trick their teacher
@I Am Captain Obvious,. Yeah, thanks captain obvious
@I Am Captain Obvious, this is why we love you captain obvious
@seeUpee, and I love you random citizen
@I Am Captain Obvious, that's obvious
@hasher2288, it did a funny. Well at least I think it did.