Thief
"They are allowed to use a wide variety of magical items, weapons, and armor" (Rogue)
"Use Scrolls: At 10th level, a thief gains a limited ability to use magical and priest scrolls. A thief's understanding of magical writings is far from complete, however. The thief has a 25% chance to read the scroll incorrectly and reverse the spell's effect."
Bard
"They are allowed to use a wide variety of magical items, weapons, and armor" (Rogue)
"Upon reaching 10th level, a bard can attempt to use magical devices of written nature-- scrolls, books, etc. However, his understanding of magic is imperfect (although better than that of a thief), so there is a 15% chance that any written item he uses is read incorrectly."