Topic: My "Duh" Moment...

Do you know which side of the car your gas tank is on? If you've had your car for any length of time, that info is more like a reflex at this point.

However, one European woman apparently had quite a bit of trouble remembering where her gas tank is, as captured on a surveillance video going viral on the internet.

The video has already racked up more than 6 million views since being posted on Dec. 30. The woman is seen driving up to a gas pump again and again before she finally gets it right. Imagine her relief!

Maybe the car was a rental, or maybe she was just having one of those days? We're sure you've all had a "duh" moment.

So, for Friday's #9amtopic, we ask, what was one of your "duh" moments?