Oh my gosh I got up this morning and my husband accidentally sat on my retina macbook 15" for just a slight 3 seconds until he realized that it didn't feel right! Silly me I left a small pillow / cushion on it because my gigantic great dane love to rest her head on it, it is her way of protesting that I am on the computer way too much! Anyways, nothing is wrong, seems the screen is a little clearer and brighter even, maybe just my imagination or shock, but I suggested he sit on my 17"mbp as it has more surface area. For a good chuckle. I guess I got the 'accidentally sitting on a macbook' test out of the way, it is safe to sit on my macbooks (as long as there is a good cushion / pillow already on it). Lots of LOVE to all.