Everyone's heard of "Pass the Parcel", so you might think this sounds a bit lame as a youth group game, but it can work well if you add a little twist.
For those that don't know "Pass the Parcel", you wrap up a prize (eg a box of chocolates), then add multiple layers or wrapping (up to 20 times). Within each layer, add a smaller prize (such as a lolly or small chocolate).
The group sits in a circle and "Passes the Parcel" around the group with some music playing in the background. When the music stops, whoever is holding the "Parcel" unwraps one layer and keeps the small prize hidden within that layer. This continues until the last layer is unwrapt and whomever has the parcel wins the prize.
Now, the twist. As well as adding a small prize within each layer, add a written "Challenge" of some sort that the person unwraping the layer must complete. The challenge can be something the person must do in front of the group, or something share
As a result, you end up with a game that is fun, but also doubles as a sharing game and a great icebreaker.