Quite simply my favourite internet meme of recent years. It beats cat breading and planking by far.
Basic priciple is that you have to simulate in a photo, the moment in Star Wars when Darth Vader appears to choke one of his colleagues and lift him in the air.
Here are my top 5 Vadering pics:
#5 Casual Vadering while drinking
#4 The double Vader
#3 The girlfriend Vader
#2 The kid Vader
#1 The Teacher Vader