My favorite day of the week is Saturday. It's cliche, but not for cliche reasons. Yes, it's a free day off, in most cases people don't work or go to school on Saturday. However...
My little brother lives with his dad (we have different dads) and although now hes in college, and comes over whenever he wants. When we were both kids, he was only allowed to come to my moms house every other weekend. Hence, we spend most of our memories together on Saturdays. So that's one reason.
Also; Toonami currently airs on Saturdays nights! If that's not reason enough to love Saturday I don't know what is ^.^