The answers to the clues below will have something in common.

1. Normal distribution symbol
2. Classic excuse of the accused
3. Point where it starts to hurt
4. Mayor's ceremonial gift to a visiting dignitary
5. Strongly disagree with someone
6. Completely lose your composure
7. Term used in baseball, bridge, and tennis
8. Volume, treble, or bass adjuster, perhaps
9. "Fragile" partner, often
10. Tub safety feature

Answers:

1. Bell curve
2. "I was framed."
3.  Pain  threshold
4. Key to the city
5. Lock horns with
6. Come unhinged
7. Slam  
8. Knob 
9. Handle with care
10. Bathmat

Credit: LA Times Crossword
Sylvia Bursztyn and Barry Tunick
IT'S THE DOOR