Thanks elh - the science bit is a great tip. I'll try that. (In fact, I think actually explaining the science of what happens to body systems when someone gets hit by a car is the only thing that sunk in for DS4, who still thinks he's invincible. So we'll give science of evaporation a try.)

I know in my heart that DS4's sensory issues are real, but i'm still irritated! I try to keep a calm face now, but it's hard. I'm glad to hear that your DS9 is better. There is hope!