How do I make a brick switch between anchored and not anchored?

I want to know how to change a block from being anchored (stays in place) to not anchored (falls down) when a specific block touches it.

Use the Touched event.

local part = script.Parent
part.Touched:connect(function(hit)
	if (hit.Name == "SpecificBrick") then -- A 'SpecificBrick' hit the part!
		part.Anchored = false
	end
end)