- Mercury in Cancer opposite Pluto Rx in Capricorn: 18 degrees
Pluto burrows underneath the words and exposes the truth. Since we're dealing with an opposition, that exposure will come via a challenge or projection (from an external source). Someone "out there" will be the recipient of your potent, unconscious issues. Or, they will confront you with a manipulative challenge.
Cancer suggests the family/childhood stuff may be dredged up. For example, your conversation with a partner escalates, and suddenly you're talking to your mother. Maybe a family secret is exposed. Whether you're receiving or projecting, this influence can be invaluable for shining a dark light on unacknowledged issues.
You'll know you've stumbled across those issues if the vibe becomes extreme - they force you to agree with them, you must make yourself heard, they must discuss subject X. Pluto takes it to the limit and makes it non-negotiable. That's your cue to step back and consider what the conversation is really about.