After getting a freebie I wanted to pay for one so you would pay it forward for me. Btw I use a grab bag w/30 die of which 1 is unique, when drawn the jengo falls down. I this is better than other dice ideas as there is a immediate loss mechanism that other alternatives miss.
Thank you very much for your support!!
And the grab bag idea also sounds very good and should make a scary experience - we'll give it a try next time we play a Jenga game, probably also removing one of the normal dice each time you draw them, so the difficulty increases by each pull!