I used to troll the scammers who posted their phone number on Yahoo! Answers
As in, I would literally call their number. I had to get a caller ID faker app, because I would call them every time they posted the number.
My favorite one went a little something like this:
Scammer: Okay, now I am wanting you to go to the following website: www.[redacted] Me: Okay, www, D-O-T... Scammer: No, you do not spell the word dot, dumb guy, you press the dot on your keyboard. Me: ...There's a period key... Scammer: Yes, that is the button, just press it. Then— Me: How many times? Scammer: Just the one time. Me: Okay... Scammer: Now type— Me: I pressed it. Scammer: Yes, very good. Now I am needing you to type [redacted].com— Me: Again, that's not the word dot, right? Scammer: Yes, correct. You are pressing the period key. Now type C-O-M slash— Me: S... L... A... Scammer: No, stupid mother*******, the slash key. Me: Oh, the little diagonal line? Scammer: Yes, the diagonal. Now type [redacted]. Me: Okay, now what? Scammer: You typed it, yes? Me: Yeah, but it's not doing anything. Do I have to press enter? Scammer: Yes, stupid b****, you are pressing enter. Me: Okay. Scammer: Now, are you at the next web page? Me: Yeah, but... why is it just a picture of a man having sex with a camel? <CLICK>