We all have seen pictures, videos, movies, etc., and we can all agree that the dwarves know how to party. They can sing, they can laugh and tell jokes, they can throw parties (they even invite orcs, though unwillingly) and they love people.
. . .
Most of the time.
The dwarves can sing, and they have fun doing it. The funnest song that they sing is the one in Bilbo's house, the one that drives Bilbo nuts; after all, that's what Bilbo Baggins HATES!
And then the more depressing (but beautiful-sounding) song, Misty Mountains Cold, telling the tale of how the treasure of the dwarves was lost to Smaug.
They have fun anytime they can, whether it's floating down the river in barrels or fighting orcs, having a dinner party with hobbits or meeting with elves.
Someone is having fun. . .