Natasha has a scar from getting shot with a Soviet bullet.
Before realizing Bucky Barnes is alive, Natasha tells Captain America a story about the Winter Soldier, revealing a scar she received at his expense.
"Five years ago, I was escorting a nuclear engineer out of Iran. Somebody shot out my tires in Odessa," said Natasha.
"We lost control, went straight over a cliff," she continued. "I pulled us out, but the Winter Soldier was there. I was covering my engineer so he shot him, straight through me. Soviet slug. No rifling. Bye bye, bikinis."
It's worth a mention in case we wind up seeing the scar on-screen again or referenced in "Black Widow."
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