I only recently found that Google Chat supports /me. If you type:

Paul Lindner

/me claps

It's rendered as

Paul claps

I wonder if there any other IRC features hidden in there?

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there´s got to be Jarkko Oikarinen somewhere ;)

[ and for those who are not aware Jarkko is the inventor of IRC and currently works at Google!]

I'm sad that only 500+ plussers follow him. Probably because he doesn't share much?

I knew that awhile ago by accidentally typing it. I've been a huge fan of IRC.

yep. Try /help