have a few loose marbles

have a few loose marbles

To be or seem particularly silly, eccentric, crazy, or mentally unstable. That guy on the corner must have a few loose marbles or something, because he's been standing out there yelling obscenities at passersby all morning. My old uncle Pete may have a few loose marbles, but he's really a nice guy. What's the matter with you? Do you have a few loose marbles, or what?

See also: few, have, loose, marble

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