If you're part of the LAB you already know this technique, but I'll post it anyway for other peoples' benefit.
I bought a realistic looking baby doll, and put servo-motors in the neck and arms, for some animatronic realism. There's a baby seat ( for cars ) bungeed to my cargo rack, with the "baby" facing backward. Drivers see the kid moving around on its own back there, and get into the next lane to pass.
Every now and then some idiot wants to call my bluff. That's what the eject button and raspberry jam filling are for.