This what I found out about our friend the lobster - Do lobsters feel pain when immersed in water? Pain is a feeling applied to advanced nervous systems. Studies show that lobsters have a less complex nervous system than fish, cannot tolerate heat, and will die at 85 degrees Fahrenheit, the human equivalent to lukewarm. The temperature of a pot of boiling water is 212 degrees and causes a swift, painless death. The characteristic "scream" of a lobster when it hits boiling water is not a vocal scream, but the rush of air out of the lobster's shell when the change of atmosphere occurs.
Why do lobsters twitch after being immersed in water? Even though the lobsters die almost immediately after contact with boiling water, often the tail will move up and down. This is an automatic response to basic stimuli caused by the relatively primitive nervous system. Sometimes the lobster might start emitting a clicking sound, but this too is simply the muscles contracting after death.
We can all eat lobster and feel better about it now.
I didn’t find anything out about what language they speak, but I would suspect that Maine lobsters do speak French, Rock lobsters probably don’t.