This is one of my favorite routines to do, generally on stage but a close-up audience is great as well.
I obviously have my lemon prepared in advance with a ripped corner in a bowl with other lemons (sometimes I use oranges), and to mark which one is mine I utilize that manufacturer sticker that comes on fruits from the market. Either my fruit is the one with one, or the one without one, or altered in a way visible to me, just so I can recognize it from the others.
I like to invite a specky to come up and select the lemon. I use a simple "choose a lemon" force, where she chooses lemons then depending on if my lemon is contained in that pile we either keep or toss them. Until she has "selected" the gaffed lemon, which I make her seal up tight in a bag and promise to guard very securely until I need her later on in the evening, I then let her sit back down.
I then ask the audience if I could borrow a bill from anybody, invite a specky on stage so I can borrow a dollar from them, I tell them not to worry I'm a professional, as I rip the corner off of their dollar. Already palmed in my hand is the corner of the bill that I have secreted away in the lemon, so it's a quick change-up to hand them that corner instead of theirs. I also have them write down the serial number off of their dollar bill before returning to their seats with a promise to have a reverse of fortune before the night is over. (this is funnest with a fifty or hundred imo).
Now I have the dollar with a ripped off corner (the specky's real dollar), generally I'll just perform a TT vanish, sometimes using my flint flasher with a quick ditch for effect, however I've also used pulls, sleight of hand, and also actually burning the dollar (however I hate wasting money, only if it's a single). I then patter about the dollar traveling to a trusted place, then make the girl come on stage with the bag. They remove the lemon from the bag, and either with or without my help (depending on how clumsy I gauge them to be with a sharp knife) the lemon is cut in twain, revealing a dollar with a corner ripped off, which just magically upon examination matches the corner perfectly that was given out earlier! And the serial numbers match, it is an act of god hallelujah!
Great reaction, usually use this as my opener for smaller stage shows, or sometimes a finale for small close-up shows.
