Unless you count that pesky guest who likes to sneak up on you: electrocution.
From the submitter:
So, this guy figured out that if one ladders equals one level 3 of them will get them right to the 3rd floor, quite intersting solution.
He doesn't even have a seat belt.
So far I only have a 50% litigation rate. Could be worse.
Bonus points if you crash into a lake. ~Not-So-Handy Andy