To trip up low-flying aircraft.
The lips are moving
Disclaimer: I don't know how well this joke will work in english. What's yellow and lies in a pond? An excevator. You don't think this is funny? Neither does the operator.
Because the farther it flies, the fewer.
Because they allow 1 free carrion
They might trip on the string.
A trip without the kids
A monster on roller-skates.
Because he wanted to hide in the crayon box.