M1 ABRAMs was standing for around 25 min in sanctuary trying to sell "imi tar impulse" but when you trade him and show 5000 which is underpriced he puts a imi tar boom. I guess this is atempt of scam.
http://i.imgur.com/YeVK56u.jpg
http://i.imgur.com/Nt5NX8e.jpg
http://i.imgur.com/cpeXkVc.jpg