Space western Firefly and fantasy show Buffy are two completely different vehicles but that hasn't stopped fans from quizzing Joss Whedon about if there could ever have been a crossover between his two creations. The answer, if you're wondering, is a surprising yes! Apparently, if Firefly had continued and grown into its own established show, Joss had considered having Spike feature in a cameo role - sitting in a bar, saying 'Nothing changes. Trust me, nothing changes.' Let's just let that sink in...