Hoo-boy, after reading that 'shut up' thread, I'd rather post here!
My DD pushed me to the last day of summer, twice today, while I was on the phone, with her constant, repeated, who's that, who are you talking to, chant, over and over.

I was upset the first call (but not DD's 1st time doing this), and I explained to her (yet again) how extremely rude this was to keep repeating the same question over & over again to someone who's on the phone. I explained that I didn't call HER to talk, and didn't need a 3-way conversation. Then, she did it again on the 2nd call!

I snapped my fingers loudly at her, made the mouth motion to 'zip her lips', and when I was done, I did the BAD MOMMY thing and told her to shut-up.

Will she do it again? Probably.

Just not as frequently since she starts school in the morning.
And, as I remember, DS did the same thing as well.
