This is actually a catch-22. To safely ride a unicycle, it is recommended that you be roughly 15% overweight in order to drop your center of mass. At the same time, by OSHA standards dating to 1991, a butcher cannot have a waist size greater than 35" (that's the printed code). It sounds a little strict, and you definitely see violations of this one all the time, but if you can't see your feet in their entirity, you could end up not seeing some blood or other gore on your feet when you leave the shop floor. And the mention of feet is a clue to at least one other violation here.
It's part of a series of pics for a Volkswagen ad campaign. http://theinspirationroom.com/daily/2007/volkswagen-asks-why-take-unnecessary-risks-at-work/
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Standing on the forks while the forklift lifts you is not that bad. I used to do it all the time at my old job. Sometimes we needed to get boxes off really high pallets and I didn't want to have to bring down the whole pallet, take the boxes off them put the pallet back on. Just hop on the forks...go up about 15 feet, grab your box then back down you go. Simple and it saves time.
I've done this. I know that you're not supposed to use a fork truck as a manlift, but when you have a fork truck and would have to rent a manlift for one job, I'd use a fork truck as a manlift. Sit down on the forks and it's reasonably safe.