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From what I see in how to use a scroll, I believe that most people know the first two:
- Caster Level check if you have the Ability Score, Spell on Spell List, but not have a high enough Caster Level to automatically use it.
- UMD via Scroll UMD rules (20+Caster Level) to activate it. And if you do not have the appropriate Ability Score, you have to make another UMD check to imitate the Ability Score (d20+UMD-15)
A third one is possibly this:
Some magic items are activated by special words, thoughts, or actions. You can activate such an item as if you were using the activation word, thought, or action, even when you're not and even if you don't know it. You do have to perform some equivalent activity in order to make the check. That is, you must speak, wave the item around, or otherwise attempt to get it to activate. You get a +2 bonus on your Use Magic Device check if you've activated the item in question at least once before. If you fail by 9 or less, you can't activate the device. If you fail by 10 or more, you suffer a mishap. A mishap means that magical energy gets released but doesn't do what you wanted it to do. The default mishaps are that the item affects the wrong target or that uncontrolled magical energy is released, dealing 2d6 points of damage to you. This mishap is in addition to the chance for a mishap that you normally risk when you cast a spell from a scroll that you could not otherwise cast yourself.
Emphasis mine. Since it states that you can have a mishap on top of the scroll failure mishap, is it safe to say that you can activate scrolls blindly (UMD DC 25)?