The song "Who's That Knocking" by Katmandu explores a sense of mysterious and ominous presence in one's life. The lyrics depict various instances where the protagonist feels as if they are being watched or followed by an unknown entity. The opening line, "Who's that knocking on my back door tonight?" sets the tone for the song, implying a sense of intrusion or danger. The repetition of this question throughout the song emphasizes the feeling of being constantly pursued or observed. The lyrics also introduce the concept of familiarity with lines like "seen that face before" and "told that you were dead." This suggests that the protagonist might have encountered this enigmatic presence or situation in the past, and it has resurfaced in their life once again. The lyrics mentioning someone waiting at the corner, walking in the shadows, or laughing on the midnight telephone create a sense of paranoia and unease. It portrays someone lurking in the background, constantly present but unidentified. The protagonist feels continuously monitored and cannot escape the feeling of being watched. The song's meaning can be interpreted in different ways. It could represent the fear of an unknown stalker or a haunting presence from the past. Metaphorically, it might symbolize the internal struggles or demons we face, haunting us and never truly leaving us alone. Overall, "Who's That Knocking" portrays a sense of pervasive uneasiness and the inescapable feeling of being pursued, observed, or haunted by an unknown force or presence. The lyrics leave some room for interpretation, allowing listeners to connect the song's themes with their own personal experiences of fear, paranoia, or haunting feelings.