Cary Grant
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DisputedCommonly credited to Cary Grant; the attribution does not hold up.
To all of you out there who do not know me, I wish you a Merry Christmas, and to all of you who do know me, I ask, ‘What the hell were you thinking?’
Cary Grant · television
Attributed to Grant in seasonal quotation round-ups.
On the attribution

There is no record of Grant delivering any Christmas message containing this line, in any speech, broadcast, or interview. The joke's construction belongs to later stand-up comedy, not to anything he is known to have said.