Common enemy joke

I have an inquiry that this group may be able to answer. I'm looking for a related joke or a video describing how complete strangers become friends once they have a common enemy. For the life of me I cannot remember this stand up routine in which the comedian describes the exact situation in which two complete strangers give each other a knowing look once they realize the old lady in front of them in a checkout line is writing a check or pulling out change. Any help is much appreciated.

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