The Worst thing that could happen from a Gay Marriage is

... ... 2 Jewish mothers. LOL. This is an old clip from The Daily Show.
(Relevance from 2.10min into the clip)

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Well, maybe 2 Chinese mothers or 2 Singaporean mothers could be worse.
"Do your homework now, or you will be sweeping roads"
"listen to your mother"

"Stay at home during the 7th month"
"listen to your mother"