"In Too Deep" is a song by Sum 41, released in 2001 as part of their album All Killer No Filler. The track features a blend of pop-punk and alternative rock, showcasing the band's energetic style and catchy melodies. The lyrics explore themes of emotional struggle and feeling overwhelmed in relationships. The music video for "In Too Deep" features the band performing in a swimming pool, emphasizing the song's themes of being submerged in feelings. The song received positive reviews and contributed to Sum 41's rise in popularity during the early 2000s, solidifying their place in the pop-punk genre.