My T&T director has a list of questions for our bonus night . . . . but personally, I'd look through the books (whichever ones are most current for your group) and make up questions from the books!
The Start Zone is a good place to start . . . it's far enough back to make them think, but important enough and repeated enough that they should know it.
Do nothing out of selfish ambition or vain conceit, but in humility consider others better than yourselves. Philippians 2:3
11What goes into a man's mouth does not make him 'unclean,' but what comes out of his mouth, that is what makes him 'unclean.' " Matthew 15:11
26If anyone considers himself religious and yet does not keep a tight rein on his tongue, he deceives himself and his religion is worthless. James 1:26
6The tongue also is a fire, a world of evil among the parts of the body. It corrupts the whole person, sets the whole course of his life on fire, and is itself set on fire by hell. James 3:6
10For, "Whoever would love life and see good days must keep his tongue from evil and his lips from deceitful speech. 1 Peter 3:10