<p>First of all, you must realize that all squares are rectangles, so if a square can do it, a certain number of rectangles (those that happen to have 4 equal sides--squares) can too.</p>
<p>If you don't want to go there, you can just ask yourself, "Why would a rectangle be any different than a square?" Just imagine a shape that's basically a square but one side length is very slightly larger than the other--so slight that you can't even tell it's not a square. Of course, this would be a rectangle, but it would still be able to intersect at 8 points.</p>
<p>Finally, for that image, you can simply make the circle slightly bigger or the rectangle slightly smaller and it will intersect at 8 points.</p>