[Ditter]

She probably bought it as a gag gift for one of her friends, who she intended to embarrasses at their b-day party. Look who was embarrassed instead!

[goodnesswins]

BUT....wouldn't an intelligent person remove the batteries!!

[Uncle Meat]

She probably bought it as a gag gift for one of her friends,

I doubt that.Something like that wouldn't include batteries when she purchased it.Having batteries in it means that it is ready to be used.She planned on sneaking to the lady's room with it whenever she got on the plane.