Have your group stand in a circle. Provide three different numbers of elephants. If you prefer, you can utilize the names of the people in your particular group. For example, you can say, "There's five elephants in Sarah's pocket, three elephants in John's shoe, and 1 elephant in Amy's hair". Then, simply ask the group how many elephants there are. Most of the group will assume that you did some kind of complex math involving the numbers you previously stated. But, of course, it's much simpler than that. The number of words in your final question is also the number of elephants. For example, if you phrased the final question as, "How many elephants are there?", there would be five elephants to match the five words in that question. If you phrased it, "How many?", there would be two elephants, and so on. Have each member of the group guess a number (you'll probably get a wide variety) and then tell them the answer. Keep going until most of the group has figured the riddle out.
This one requires two leaders who know the secret of the game before it begins. At the start of the game, these two tell the group that they can "read minds". To prove it, one of them leaves and goes to a place where they cannot see or hear the rest of the group. In their absence, the rest of the group decides on an object in the room that this person must identify using only their "mind-reading" powers. This object can be anything in the room. When the person returns to the group, the other leader who knows the trick begins to question them about the object. The questioning should go something like this:
Leader 1:"Is it the couch?"
Leader 2: "No"
Leader 1:"Is it Abby's purple shirt?"
Leader 1:"Is it that black shoe?"
Leader 1:"Is it the poster on the wall?"
Leader 2: "YES"
Here's the secret of the game. Leader 2 knew that the poster was the correct object because it came after a BLACK item (the shoe). Hence the name "Black Magic". Keep playing until someone figures out the trick. Once they do, they can volunteer to be the one to leave the room and prove their mind-reading abilities.
Stand in front of your group and say, “Watch carefully and do exactly what I do.” Stand up and hold out one hand, palm facing the audience, with all five fingers spread. Touch each finger with the other hand's index finger, from the pinky to the index finger, then slide the other hand's index finger down between the index finger and the thumb, then touch the thumb, and then repeat the sequence in reverse. As you touch each finger and the thumb, say "Johnny"; as you slide the finger toward and back from the thumb, say "Whoop". The result is the sequence, "Johnny, Johnny, Johnny, Johnny, Whoop, Johnny, Whoop, Johnny, Johnny, Johnny, Johnny." After that, clasp your hands together. Then, ask your group to repeat what you just did exactly. Often, the group will do the finger sequence correctly, but not realize that the hand clasping is an essential part of the process. If they leave that part out, they did it wrong. Keep showing them the hand motions until they repeat everything.