This one isn't that difficult, but funny to see. Place a row of lighters on the table close to eachother, for instance all your friends in the bar. Place them with the caps to the right and to the left (as shown in the slideshow), use one lighter to light the first lighter and the flame will run to all the others. Try how many lighters you can light in a row.

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Like the idea, imagine if you had 100's, that would be interesting.