A custom exception file with GIF instead of scary ghost

exception.html.twig

<div class="sf-exceptionreset">

    <div class="block_exception">
        <div class="block_exception_detected clear_fix">
            <div class="illustration_exception">
                <img alt="Exception detected!" src="http://damienalexandre.fr/lab/random-fail" style="width:145px" />
            </div>
            <div class="text_exception">

                <div class="open_quote">
                    <img alt="" src="{{ asset('bundles/framework/images/open_quote.gif') }}"/>
                </div>