Vincent van Gogh (ear reference)
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Dutch Post-Impressionist painter Vincent van Gogh famously cut off part of his own ear in 1888 and reportedly sent it to a woman. Frasier alludes to this incident.
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Mentioned once in The Bad Son.
The Bad Son
Season 8 · Episode 3 · S08E03
“I might as well just lop off my ear and mail it to her.”