If you ever have the chance to go and see Maroon 5 in concert, I highly recommend it. You'll see and hear a lot of cool surprises, like this:
This video below shows Adam Levine singing Maroon 5's hit song "Misery." Fast forward to about 1:56, and you'll see him quickly transition into covering one of the most popular songs of the summer.
I cannot get enough of this cover! Wish I was in Ohio to see this live.