So Joe Walker, who plays Tom Riddle/Voldemort in AVPM, had been rehearsing for 8h and was in costume for Voldemort but really wanted a power bar so he asks Jim Povolo, who plays Goyle in AVPM, to go get him one. Now he’d had a really long day and just needed that power bar. Then, Jim comes back with a Snickers marathon bar and Joe didn’t want a Snickers he wanted a power bar. So in full character, including the voice Joe said “Snickers?!” And that quote has lasted ever since.