So, “Blue Man Group.” It is quite simply not a traditional night at the theater. This rock show-meets-performance art piece is still going strong after nearly 30 years, and still manages to keep the shtick fresh for audiences new and old. For the uninitiated, Blue Man Group is three guys dressed in black outfits, blue makeup and blue headpieces. They never speak, using body language and facial expressions to communicate. The show features no real plot – it’s a series of comedic set pieces. There’s a backing band that rocks the house, various visual gags, audience participation, oddball percussion instruments constructed from PVC pipe and assorted mischievousness. Oh, and toilet paper. Lots of it.