People spent $86 on average for Halloween this year, including for their dogs. We talk to Full Disclosure host Roben Farzad about how Halloween became such a staple of consumer — and now Instagram — culture. Also, the name Theremin might conjure the eerie sounds of horror films or sci-fi movies like 1951's "The Day the Earth Stood Still." WBUR's Andrea Shea talked to some contemporary artists collaborating on a performance to celebrate the early electronic instrument's upcoming 100th birthday.