When you were introduced to Thermomix you will have been warned NEVER to leave your Thermomix to knead unattended because it might just "walk" off the counter top and end up spread across the kitchen floor.
Well one tip I came across is that if you really do need to leave the kitchen while your Thermomix is kneading, just pop it in the sink (make sure the sink's empty and dry of course!) and off you go. If your Thermomix then tries to go walkabout, the sides of the sink will keep him/her firmly in one place.