两人都将右手举起，五指伸展，一起击掌，这种手势在美国很常见。在美国文化中，这种手势表示很热烈地赞同或接受某一行为或某件事。这一手势有可能来自罗马，那时人们将右臂举起以表示对帝王的称颂或敬意。

The slapping of the raised right hand with the open palm of another person's right hand is a pervasive gesture in American culture that indicates enthusiastic approval and acceptance of a deed or incident.This gesture may have sprung from the old Roman gesture of raising the right arm in praise of tribute to the emperor.