A woman is under arrest after Austin's famous Frog mural was defaced with obscene words Christmas Eve. "The Frog," as it it known locally, was painted by singer-songwriter Daniel Johnston and was once worn as a T-shirt by Nirvana singer Kurt Cobain. Johnston lives in Waller, about 40 miles northwest of Houston. ...Rebecca Guest, 32, was caught red-handed by officers who saw her at work on the mural on Tuesday, according to a police affidavit. ...According to the affidavit, Guest told officers "she was covering it in expletives to force the owners to take it down completely." Officials said Guest...