Twitter filed to go public yesterday, choosing the stock ticker TWTR. Twitter shares are expected to start trading before Thanksgiving this year.

But it looks like some investors are a bit confused. A company called Tweeter Home Entertainment, which has the stock ticker TWTRQ, was up as much as 1,500% today, but fluctuated wildly. It ended the day up more than 684%.

The stock was halted for a while after several outlets reported the news.

Take a look at the chart: