The 100th episode of Pretty Little Liars airs tonight and we're beyond excited! Not only does Ali return to Rosewood High and Caleb reunites with Hanna, but we find out who was really in Ali's grave. Dun dun duuunn.
To celebrate 100 episodes of PLL, we've gathered the 10 creepiest messages A has ever sent the girls. Click through, then let us know which notes freak you out the most in the comments below! Will you be tuning in to tonight's episode?