Clocktower 3 for PS2.
Should have known something was up from the $4.99 price tag Gamestop was selling it for. In the first one for SNES (the second for PSX was just a remake/port), the antagonist would show up only in certain areas or at specific events, and had a random chance for appearing in certain rooms. Sometimes he would pop out of a box that suddenly shuffled. Sometimes it would shuffle, but then just be a cat that jumped out. Basically, he threatened you every now and then, but he did so sparingly so as to preserve the "Oh sh*t! It's him!" effect. Clocktower 3 on the other hand, has no such pacing.
In Clocktower 3 the antagonist (a new, different one) just will not leave you the f*ck alone for more than thirty seconds. The only way to get him off you is to run into a corner where he can't reach you then wait for him to go away, if he even decides to do so at all. (otherwise you're stuck because the game just doesn't register the fact that he can't reach you and should probably bugger the f*** off for awhile.)
This wouldn't be as bad if you didn't have to go through your normal survival horror regimen of "puzzle" exercises, by which I mean, trying to find where to go next, then figure out where the d*mn key/lever/switch/random object that unlocks it is. Keep in mind, you have about thirty seconds of freedom to explore and try and figure this stuff out before the antagonist shows back up YET AGAIN, forcing you to run for cover or die. So yeah, trying to be scary, but gets annoying REAL fast.