Today I used Ruby's Kernel::abort for the first time. It's one of those incredibly useful methods I can't believe I've never seen before.
Observe:
# abort.rb {1}
def no_message
abort
end
def message
abort('Process terminated')
end$ irb
2.2.2 :001 > require './abort'
=> true
2.2.2 :002 > no_message
$ irb {1}
2.2.2 :001 > require './abort'
=> true
2.2.2 :002 > message
Process terminated
$
Use it to bail from a script.