Mingle

Mingle is a great game for groups who are either a) very comfortable with each other or b) enjoy mild awkwardness induces by touching new friends.

The game uses one "caller" and can be played with anywhere from 4-100 people.  Everyone mingles together, usually singing "mingle, mingle, mingle."

The caller can then call out a plethora of options.

For more appropriate games, it could be a group of 5 people who were born in the same state as you and other such thoughts.

The caller can also use more comical ideas such as:
Skydive! (one person lies on the ground and arches so their arms and legs are off the ground and another person lies on top of them perpendicularly doing the same arch)
Princess (one person jumps into another person's arms as if they are being carried over a threshold)
Spoons (three people spoon each other with the person at the back throwing their leg over the other two)
Cowboy (one person gets down on all fours and another "rides" them by straddling them and makes lasso motions with their arm)
Milk the cow (one person gets on a high all fours while another pretends to milk their stomach as they would a cow)

What other ideas do you have for callers?