Give the wench a wedgie

You immediately accelerate to the speed of light, and dance around the wench's stationary form to appear behind her. Slipping your hands down past the small of her back, you slide them down into her skirt and rummage around until you find the waistband of her panties. Grabbing hold, you heave the panties up and out of the back of the wench's skirt, pulling them into a painful looking wedgie. Leaving her panties hanging over the back of her skirt, you zip back to your seat, and fully slow back to normal speed.

The serving wench's eyes widen as she suddenly feels like something isn't quite right down below.