Police overseeing a gun amnesty in Florida were shocked when a man handed in a surface-to-air rocket launcher.
Under the "Kicks for Guns" programme, anyone who handed in a weapon was given a pair of trainers.
And one man, who has not been identified, took advantage by exchanging the four-foot-long launcher for a pair of Reeboks for his daughter.
The owner - taking advantage of the no-questions-asked policy - said he found the weapon in a shed he tore down.
He told the Orlando Sentinel: "I didn't know what to do with it, so I brought it here.
"I took it to three dumps to try to get rid of it and they told me to get lost."
Besides the launcher, police collected more than 250 guns.
They were all exchanged for trainers or £25 gift certificates.