Possible reply to "Who's responsible?"

• Two-word turndown
• Stiff denial
• "Don't look at me," more formally
• "Don't look at me!": 2 wds
• "You must be looking for someone else"
• Denial of a sort
• Frequent comeback to the Little Red Hen
• ''Don't look at me!''
• Answer to the Little Red Hen

Wikipedia Word definitions in Wikipedia
NotI is a restriction enzyme isolated from the bacterium Nocardia otitidis .