The Smiler, Alton Towers, Staffordshire, UK

Four riders on the multi-looping coaster were hit by the car’s guide wheels, but no one was seriously 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>