Fictional Grandma Myrna Tellingheusen has been making her followers on Twitter chuckle since 2015, with her satirical pearls of wisdom lampooning the kind of stereotypes that the elderly deal with on a daily basis. While Myrna's true identity is not known, we here at Bored Panda managed to get a few words from the person behind the account in a previous post. " "I exist in a modular home park in Rainbow, California, a sleepy little town just nor…