Freddy was a complete sweetheart. As you have witnessed, he would collapse for a "facepalm" or at the merest mention of the word "******". He would "speak" ie whimper. He would quiver like a jelly, for the word, "quiver". He would do a "full collapse" which entailed laying on his side, motionless, (which was the same as a collapse but this time tail and eye movement would cease).
Unfortunately the night before, Freddy and I perfected "DEAD". He had long been able to lay upside down position, but he finally got the upside down, legs straight out, dead sheep position.
Next day he was gone...
He will be missed.