Saw this route years ago and finally did this in a Ford Ka I bought for 500 euro's

?? What's there to finish. He bought it for 500 euro's

It’s a joke on the use of an apostrophe. The proper (and in the EU, legal) spelling of Euro is “Euro.” A proper plural isn’t specified. “Euro” itself can be used as a plural form (it’s 15 Euro..) bit of one crosses to add an “s” to create a plural there’s no rule there- Euroes, Euros, etc- and whatever language the speaker is using they can follow the general conventions thereof. However in this post- “Euros” is written as “Euro’s”, the apostrophe “s” is a possessive form- indicating that the euro owns something. “The apples are Jims!” Means: Each Apple is in fact named Jim. “The apples are Jim’s” means that the apples belong to Jim.