Can You Correctly Name the Colors You See in The Stroop Test?
This test will make your brain feel like a three year old phone after updating your operating system. The hardware can't keep up and everything gets all laggy.
The Stroop Test is supposed to do that, so I suppose it's okay. Named after John Ridley Stroop, who published a paper on the effect in 1935, the test demonstrates how our brain gets all muddled when it receives two pieces of conflicting information at the same time.
Here's a demonstration from science dudes who are not only smarter than me but also have more impressive guns.
Glutton for punishment and want to try again without the video? Here is a brief example that may actually be harder than following along with what those guys did.
Maybe when you're off contract you can trade in for a new brain that works better with the latest software...