Not at the US immigration side of US CBP, but with US customs the following conversation took place ca 1998 with a dear friend of mine from Norway (farmer’s boy) and one of the custom agents as my friend was stopped with a salted, dried leg of lamb (Norwegian delicacy)…
Customs: “You are aware that bringing meat into the US is illegal?”
Friend: “No, I wasn’t”.
Customs: “Well now you are, and it is a serious offence”
Friend: “Isn’t there any way around this”?
Customs: “Well, with a statement of clean bill of health from a veterinary we could have made an exception”.
Friend: “Well, the last time I saw this specific sheep it look ok. But I guess now it has a limp”.
Not a flinch of smile from customs agent. How he had the stomach to pull a joke like this is beyond me, but it remains one my favourite travel tales of all time 🙂