An Oklahoma girl was left brain dead after she participated in the dangerous “ Benadryl challenge ” social media trend, according to reports. Leah Presson, 15, is in an intensive care unit after the dangerous trend — which encourages teens to overdose on allergy medication — triggered a catastrophic series of seizures and cardiac arrest, NewsNation reported. Now, there is no activity in her brain. The trend, akin to “ robotripping ,” involves ingesting enormous amounts of diphenhydramine, the