Purple Sunbirds; from my home, Delhi.
The quality of the pic is horrible, but I couldn't resist uploading this(because of the behaviour). This is basically a happiness dance and display which is seen before a pair mate. Just pure bliss, it seems, of finding one another - no commercial purpose, no selfish means.
I observed them for a little over 10 minutes, and as in this pic the male and female were dancing, and singing what sounded very much like "And I love her" [by the Beatles] ;-)