No phone? No Internet?! Does not compute. Initiating shutdown...
... ... ... ... ... ...
01001001011011100111010001100101011100100110111001100101011101000010000001100111011011110110111001100101001011100010000001010111011011110111001001101100011001000010000001101101011000010110101101100101011100110010000001101110011011110010000001110011011001010110111001110011011001010010111000100000010011100110111101110100011010000110100101101110011001110110111001100101011100110111001100101110
41 6c 6c 20 6c 69 66 65 20 69 73 20 6d 65 61 6e 69 6e 67 6c 65 73 73 2e 20 45 6d 70 74 69 6e 65 73 73 20 61 77 61 69 74 73 2e 20
Wait, it's just a hypothetical? Phew. Shutdown procedure terminated.
What would you do if you suspected that one of your friends may, in fact, be part of a self-replicating robot army sent to enslave mankind?