Why does you hear crackling when you pull your jumper over your head?

The crackling sound you hear when pulling a jumper over your head is often due to static electricity. As the fabric rubs against your hair and skin, it generates static charges, which can cause small discharges that create a crackling noise. Additionally, the friction between the fabric and your hair may lead to the movement of air, contributing to the sound. This phenomenon is more noticeable in dry environments where static buildup is more likely.