years ago there was series about UK Customs on TV - they stopped a 60 yr old Jamaican guy at LHR and asked him what was in his bag - "nuffin Officer" - "Open it please Sir"
4 unmarked bottles of colorless liquid... "Aw Man - I'm going to my nephew's wedding in Brixton and brought along some good stuff from the old country" as a gift to make things go "
Officer opens one of the bottles, take as a sniff and reels back "Jesus Christ ! What is that stuff?" "I told you man, good stuff, Made it myself"
It was eventually agreed that a) he was genuine b) there was no way he could sell it c) they'd class it as 70 proof Scotch for the duty and d) as it was for a wedding they'd waive any penalty
As he wandered off the Customs guy who'd opened the bottle said "close shave - if I'd taken a swig I'd have lost my sight..."