That was a good one...
I know there are people that's tried with pizza:
1. Find a group of people going into a pizza takeaway.
2. Follow them as they walk into the place.
3. Stand around with the group when they order the pizza's
4. When they pickup the pizza walk out with them
5. Wait around 10 min and phone the pizza place, list the pizza's that was order and explain to them that it was atrocious and you threw it away demanding a replacement!