Jayne, I am sure you would have the same kind of attitude if you had someone with a big lens kept shooting you without merci!...
LOL!!!! Louis, you may be right!
If you're ever lucky enough to be in a myna's "audience" when one launches into a very demonstrative "soliloquy" (for lack of the proper ornithological term), you'd see an entire range of emotions from this adorable little critter. His cousins, the Black-Collared Starlings, sometimes perform similarly in duets, which is extremely entertaining.
Then again, this critter may have just been p*ssed at the intrusiveness of the lens . . .
As for "merci," I always thank any critter friends who sit for photos. I firmly believe that birds and dragonflies understand intent if not language, because so many of them consistently honor me with their trust.