A party of girl scouts
 

While leading a party of girl scouts through the woods in silent Indian fashion, our troop leader suddenly came upon a clearing where a young couple was engaged in an indecent act.
"Back ladies, back!" cried the leader. "There's a very dangerous beast out there!"
But it was too late, several of the kids had more-or-less seen all. They asked their leader what was happening.
"Well, if you... er... must know, they were practicing a brand new form of artificial respiration."
"WOW!" exclaimed the oldest of the group. "I know which merit badge I'm gonna try for next!"