Show off your love for the Big Bang Theory with this black graphic tee featuring Penny and the iconic knock knock joke. Made from 100% cotton knit fabric, this regular fit t-shirt is machine washable and perfect for all seasons. The crew neck and short sleeves provide a comfortable and classic look, while the easy care and stretch features ensure a comfortable fit. This T-shirt is perfect for any fan of the hit TV show and is sure to make a statement. The black color and graphic print accents make it a versatile addition to any wardrobe. Whether you're dressing up or dressing down, this Ripple Junction brand tee is a must-have.                            All preowned clothing has been properly cleaned to conform to's hygiene standards.