I've seen the effect of two people mimicking each other at a motivational meeting. From this, I presume that the situation would devolve into fits of laughter.

I've seen the effect of two people mimicking each other at a motivational meeting. From this, I presume that the situation would devolve into fits of laughter. Both people would be inclined to be cheerful. If this was mimicked then both people would be increasingly jovial until both would be laughing uncontrollably.