Being one of the earliest Hard Rock bands, panned by critics and shunned by radio until they released “We’re An American Band” in 1973, Grand Funk Railroad seems like a strange match for early corporate sponsorship let alone being wrapped around a Slurpee. Which makes this one of my Kitschiest Slurpee Cups as pop acts like Smokey Robinson and The Fifth Dimension, who also snuggled up to 7/11, made more sense as a commercial match. For a moment at least, Grand Funk was singing “We’re An American Brand”.