Taarak Mehta Ka Ooltah Chashmah S01 E4573 Tapu Sena Ki Smartness

"Problems Toh Hain Sabke Saath, Bas Nazariye Ki Hain Baat!"

Using their quick thinking, Tapu Sena swaps Abdul's cycle, leaving Chunnilal annoyed when he realises he stole the wrong one. Later, while trying to remove the mark from the cycle, they uncover something unexpected. What could it be?