The Jethalal looking from window meme originates from the Hindi sitcom Taarak Mehta Ka Ooltah Chashmah. In episode 702, Jetha (the character played Dilip Joshi), Daya (the character played Disha Vakani), and Champak (the character played Amit Bhatt) arrive at the hospital to see his cousin Premji. After speaking with the patient, Daya and Champak find that there was a misunderstanding due to a misdialed phone number. Later, Jetha arrives in the ward after peeping through the tempered glass window of the hospital door to meet the mistaken relative. Although the popular use of Jethalal looking from window meme is to mock someone who is envious, some variations of the meme (like replacing Jethalal with another character) are frequently used.
