Police in Twin Falls are warning residents to be on the look out for two men going door-to-door claiming to be offering free popcorn samples.  Officers say the vendors' request to use a homeowner's microwave is likely a ruse so they can case houses prior to burglarizing them. The Times-News reports police received several calls Tuesday reporting the men and their unusual request. Police are warning residents against letting strangers into their homes and say they should call police if the vendors become aggressive. In this case, the vendors are described as an older male with a round face and one younger male in his 20s with a dark complexion and short hair.