 has stopped working.</p>
<p>In this script, the author has mistyped the UNTIL line, accidentally writing a 0 rather than a 10. <strong>count</strong> starts from 1 and continues increasing, so the loop never ends; the script keeps running until the computer breaks down or until human civilisation collapses (whichever happens first).</p>
<pre><code>    ! Count from 1 to 10
    LET count = 1

    DO
        count = count + 1
    UNTIL count = 0

    PRINT "Finished!"
    END
</code></pre>
<p>A typo like that