Undercover (Formal Edition)

So, my first homecoming dance is Saturday. I'm trying to brainstorm movies where people go undercover, sneak in, or snoop around at a formal event. I know this happens quite a bit in movies. So, if any scenes come to mind with the lead dressed in a tux or evening gown, staring suspiciously at other guessed and sipping their drink, please let me know.

True Lies came to mind first for me.

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If Looks Could Kill aka Teen Agent

No Man's Land (1987)

Notorious
1946, Alfred Hitchcock

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"Film is a disease. When it infects your bloodstream it takes over as the number one hormone. It bosses the enzymes, directs the pineal gland, plays Iago to your psyche. As with heroin, the antidote to Film is more Film." - Frank Capra

Cool guys. Thanks.

And Holden naturally I ended up remembering Notorious right after I posted

Good answers, but we need to come up with some sneaky, overdressed females. Hitchcock may well be the place to go for that too.

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It's what you learn after you know it all that counts. - John Wooden
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To Catch a Thief is another good one for this too, huh?