[ WP ] Story about a superhero whose powers come with a strange side effect or drawback

> Perhaps the oddest super-human ability was that of Johnathan Banks, known by the moniker Squirro. At will Banks was able to make himself: 
 
 > * preternaturally fast, both in movement and reaction time; 
 > * literally capable of stopping a full speed train as he once did; 
 > * totally resistant to all known poisons, including several designed to circumvent his resistances; 
 > * incapable of being destroyed or even harmed via blunt force trauma, lacerations, small arms fire, anti-tank weaponry, flames, asphyxiation, plasma torches, thermite, dehydration, starvation, liquid nitrogen, liquid oxygen, and even once a small-yield nuclear warhead ( these were all attempted at various times ); 
 
 > However using these abilities left him in a trance-like state, functionally with the mind of a Squirrel which responded to the name Chubbs. With extreme ingenuity Banks was capable of using these powers to save no less than 317 people from death, and several hundred more from dismemberment or less grievous injury. When asked how he was capable of managing the trance-state before-hand ( as he was never able to break the trance-state himself ) and saving people while entranced, Banks only said, `` let's just say it takes a big pair of nuts.'' 
 
 page 49, *The History of Supermen: A Legacy of Greatness*
