Some of the emails had the subject line, "Think Twice." They were sent from a spoofed email address. The sender claimed to have had an associate plant a small bomb in the recipient's building and said the only way to stop him from setting it off was by making an online payment of $20,000 in bitcoin.
The emails had a subject line with two words
( z1 have :ARG0 ( z2 email ) :ARG1 ( z3 line :mod ( z4 subject ) :accompanier ( z5 word :quant 2 ) ) )