I just submitted an answer here, it came up with the CAPTCHA check, then I clicked the submit button once. Two same answers appeared 30 seconds apart in time. I've never had this happen before so thought it worth mentioning.
I've deleted one of the duplicate posts so only high rep will see them both
Update:
My browser history shows the following sequential actions during the process of submission - I have left nothing out.
The first entry is me doing my ahem "research" on Wikipedia
- 11:38p http://en.wikipedia.org/wiki/Windows_PowerShell#Pipeline
- 11:40p https://stackoverflow.com/captcha?s=2e53a58c-a97f-4861-b90d-9e663d52e447
- 11:41p how to use piping in C#
- 11:41p how to use piping in C#
- 11:42p https://meta.stackexchange.com/questions/ask
and the last is me visiting meta to post this question.
I'm using Chrome 5.0.375.70