sentences:  In the season 23 episode "Tegridy Farms Halloween Special", he again makes a cameo appearance; this time working at the Denver Museum of Nature and Science.Butters, under the alias "Archaeologist Butters", found him while looking for the last stamp in his stampbook.The Mechanic, next to the exhibit Butters is looking for, warns Butters not to put the stamp in the book, warning "nobody puts that stamp in their stampbook."