sometimes clicking the stream button causes double events

I've got the page in some kind of state (no js errors) where clicking the stream button toggles between 0 and 2 streamers, and the events tab is showing this:

```
josh | started streaming
* | anonymous user started streaming
* | anonymous user stopped streaming
josh | stopped streaming
josh | started streaming
* | anonymous user started streaming
* | anonymous user stopped streaming
josh | stopped streaming
```

Only 1 user (`josh`) is showing up in the list of connected users.

Steps to reproduce? No idea. I was using Chrome on Windows and there was a Ctrl+Shift+T that opened a second tab to the same server, but I can't seem to reproduce this problem with anything I try.