In my old dojo, we were having a demo and someone was short on time and took their gi out of the wash early and put it in the dryer so it would be done in time. Later, during the outdoors demo, it began to rain. His black gi turned into a white bubble gi as it began to suds up all over the mat. DISASTER! HAHA. The mats got all slippery from the soap, he was embarrassed and everyone else just tried to make the best of the situation.
Who knew you had to give a disclaimer to students before a demo to make sure your gi finishes the rinse cycle before putting it in the dryer.