There's no point in telling people this online, unless they are are still online when you tell them. More often than not, they never come back to re-read what they typed to see the comments that come afterwards. Also, they may not know that typing in all caps is equivalent to shouting. My old aunt (she's 87 now) always types in all caps and asks me to do it too when I email her, because she finds it easier to read. She has glaucoma so she's loosing her sight a little bit more each month.
I don't normally pick up calls with Unknown Name listed, but I was expecting a call from my veterinarian and thought it might be them. Oops, no one there. Glad I checked here. Won't make that mistake again. I never give money over the phone anyway.