I dislike it when people switch up the color of text randomly, and also the font size:
Red words read: ADMIT IT Floor Lava couches Survive
Also dislike: Keep Calm and [insert anything you want here] posters. I like the original, and I even liked the "Keep Calm and Eat a Cupcake" the first time I saw it. But after seeing about a million versions of this on Pinterest ("Keep Calm and Love Cows" really?!), I hate it.