I like those two- neuturedbynature. very clever. it took me a while to notice the old man in the second illusion.
check this 1st one below out- you won't believe its true, but it is. The squares marked A and B are the same shade of gray. I even checked it was true, by cutting out the boxes, copying them into photoshop to compare the two colours. they were the same gray shade
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Look at the colour chart and say out loud the COLOUR of the word. Its crazy because the right half of your brain wants to say the colour, while the left side of your brain wants to say the word. Most people say the word not the colour for the first few times.