Burn Witch Burn

A mysterious twist on a classic effect. A borrowed $100 bill is marked with a sigil of protection. It is put in one of 3 envelopes. The other envelopes hold slips of newspaper.

Three lighters are proven to operate and are randomly selected by 3 spectators. The envelopes are mixed by the spectators and handed, in order, to each spectator.

You claim the sigil will protect the money through the powers of nature. The first spectator ignites his lighter and burns his envelope. The second spectator does the same. The final spectator cannot light his lighter! The remaining envelope is unharmed! When the envelope is opened, it contains the borrowed money. Whew!

Finally, the sigil is erased from the $100 bill, and without the sigil to protect it the money starts burning. You quickly extinguish it and take your bows.