(off) on a tangent

suddenly dealing with a completely different matter.

We were talking about gas prices and you went off on a tangent about your vacation plans.

• same old same old
• same old thing
• same to you
• sang froid
• Sarcasm is the lowest form of wit.
• save bacon
• save blushes
• save breath
• Saved by the bell.
• save face
• save for a rainy day
• save neck
• save own skin
• save skin
• save someone's bacon
• save someone's blushes
• save someone's neck
• save someone's skin
• save something for a rainy day
• save the day
• have one eye on something
• have one foot in the grave
• have on hand
• have on hands
• have on the brain