gistfile1.txt

def foo
  t = Thread.new do
    begin
      sleep 1
      puts "finished thread"
    rescue
      puts "exception raised"
    ensure
      puts "ensure called"
    end
  end
end

thread = foo
sleep 0.1
puts "killing thread"
foo.kill
sleep 3

gistfile2.txt

killing thread
ensure called
finished thread
ensure called