I wish I knew about this. I wrote a file server that serves your webroot directory over League of Legends chat. Any time you request a file that is more than a few bytes, your chat gets flooded with base64 strings... The extraslow web.
At first my guild mates loved it - but then it created some guild internal drama as some "officers" were having a rather not nice chat about other guild members in the night and they thought they were alone.
Pretty much destroyed my guild. But at least I could finally say "What have I done!" and mean it ;)