Since he and his wife are crazy in the same way

[fgadmin]

Archived from the IMDb Discussion Forums — Randy Quaid

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Trik_Ster — 10 years ago(June 14, 2015 07:28 AM)

Since he and his wife are crazy in the same way

[fgadmin]

bpastor — 10 years ago(June 28, 2015 06:50 PM)

I think it's more likely to be this:
https://en.wikipedia.org/wiki/Folie_à_deux