The Ultimate, Lightwater Valley, North Yorkshire, UK

The coaster struck and decapitated a deer near the track covering riders in blood. No one was injured. Source

<span style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" data-mce-type="bookmark" class="mce_SELRES_start"></span><span style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" data-mce-type="bookmark" class="mce_SELRES_start">s</span>