There are only two that are 100% safe...but, they will cost you dearly.
"Nailed It" by Scott Alexander
http://www.penguinmagic.com/p/7997
OR,
"The Pain Game" by Jon Allen
http://www.penguinmagic.com/p/S11419
Yes, there are other versions available that are NOT 100% safe...and there is no way to 'idiot proof' those versions unfortunately.
Best wishes...