It was a sight they’ll never forget. Two co-workers from Massachusetts who took a sightseeing break during a business trip to Arizona last month ended up with a 120-pound boulder between them in the front seat of their car. Peter Wilson of Attleboro and Bob Jaczko of Natick had followed the advice of a tour guide and went to see Oak Creek Canyon. “We visited a Catholic chapel, threw pennies in a magic stream and then went to the crystal shop. We had all this mysticism around us so I think we were well protected,” Jaczko told WBZ-TV.