jack block
When you're about to cum and someone walks in, like your brother, your dad, or your mom, and it either makes you blow your load in the worst way or makes you lose your chance and feel like you've been cheated.
I was about to cum, and my brother walked in and said, 'Hey, wanna play Fortnite?'.
I was about to cum, and my dad walked in and said, 'I'm going to bed.'
I was about to cum, and my mom walked in and said, 'I'm making pizza.'