India, Dec. 7 -- A US comedian transformed an ordinary New York City subway commute into a lively birthday celebration for his sister-in-law, delighting passengers and social media viewers alike.

The man, identified as Tom Kelly, posted a video on Instagram showing him standing inside a moving subway carriage and requesting the attention of everyone on board.

In the clip he announces, "Attention people on the subway, my name is Tom. It is my sister-in-law's birthday. I'm making her a birthday video, trying to get her to come to New York City. Will you all join with me in singing happy birthday to my sister-in-law, Janine? Ready? Here we go. Happy birthday to you." Passengers soon join him, turning the otherwise routine ride into a cheer...