Credit card thieves have a lot of stress, always having to stay ahead of those who would thwart them. (Perhaps this calls for The Day of the Credit Card Thief, to recognize this under-acclaimed profession with a national holiday?)
Having mastered the skimmer, which extracts data from the magnetic stripe on cards inserted into ATM's, thieves soon found themselves confronting chip-based cards. What is a hard-working thief to do? Oh! Someone invented the shimmer, which can be surreptitiously inserted into an ATM to access information from chips, including card numbers and PIN numbers. Simple!
To read how these work and to see a photo of a shimmer: