Try to tell the colors of the words rapidly ... without reading them...

Blue

Blue

Red

Yellow

Yellow

Green

Red

Red

Yellow

Green

Green

Blue

Yellow

Yellow

Red

Blue

Blue

Red

Yellow

Yellow

Blue

Red

Red

Green

Green

Blue

Yellow

Blue

Yellow

Red

Yellow

Red

Blue

Red

Red

Yellow

Red

Blue

Red

Blue

Green

Red

Green

Green

Blue

Yellow

Yellow

Yellow

Blue

Blue

Red

Red

Red

Green

Green

Green

Yellow