I'm sure by now you've heard of a flash mob.
If not, a flash mob is a group of people who suddenly appear and perform an unusual and sometimes pointless act for a brief period of time.
This most recent flash mob was performed at the Denver International Airport last week.
Travelers were shocked when suddenly 100 dancers began performing out of nowhere.
The great thing about a good flash mob is how shocked everybody is by the surprise performance.
It's like the whole airport just stops for a few minutes to watch.
Then, as quickly as it started....it's over.