Almost half-a-century after they first appeared, you can still find plenty of mementos of one of history's most famous ad campaigns
being offered for sale by online auction sites.
The mementos in question are fake tiger tails from the early 60s, when motorists all over the world were tying them to the caps of their petrol tanks and sporting bumper stickers that declared: "I've got a tiger in my tank."
The fact that some 2.5 million tails were sold in the US alone - and that they're still in demand - is testimony to the durability of the campaign that convinced drivers that Esso fuel was so powerful that it was the equivalent of having a huge beast in their petrol tanks.
"Put a tiger in your tank" was a slogan created in 1959 by Emery Smith, a young Chicago copywriter who had been briefed to produce a newspaper ad to boost sales of Esso Extra.