My SO and I do something similar. When it (almost never) gets contentious, one of us will just yell: "I Declare Disagreement!" in the same manner that Michael S

My SO and I do something similar. When it (almost never) gets contentious, one of us will just yell: "I Declare Disagreement!" in the same manner that Michael Scott declared bankruptcy on The Office. Instantly breaks up the tension and we can take a breather before resuming more rationally.