I'm sure we can all agree that playing with construction equipment seems like a grand old time. Have a few beers, then hop in the bulldozer and see what happens, it's hard to resist.
There's a reason thought that all prescription drugs come with the warning: do not operate heavy machinery. Bad things happen.
They same warning could also apply to first-day-on-the-job n00bs. Instrunction manuals be dammed, some things you've just got to learn from a concussion.