Voice activated/automatic toilet seat
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Never get yelled at for leaving the toilet seat up ever again. The toilet would be voice activated (for both up and down) but it would also have a sensor so that it would not allow you to hurt yourself if you were too close when you (or someone else) commanded it. It would be just like those urinals which automatically flush after you leave, because this one would automatically lower the seat if it was left up when the person got out of the reach of the sensor. This way, guys would never have to worry about lowering the toilet seat ever again.