what is the silliest invention you have thought up?

Question: what is the silliest invention you have thought up?
- Keywords:
  invention,
  silly
Asked by doughnutsandcandyfloss to Agata, Chris, John, Kirstin, Michael on 16 Jun 2016.
- Kirstin Rouse answered on 16 Jun 2016:
  
  I think my answer on here covers this quite well!
  
  /aerospacej16-zone/2016/06/12/whats-the-weirdest-thing-youve-made/
- Chris Hackett answered on 20 Jun 2016:
  
  I tried to make an app which helps you cheat at scrabble

Question: what is the silliest invention you have thought up?