Ok,

Jimmy asked his dad for a new bike for his birthday.

His dad said "Sorry son, we just can't afford a gift like that, you know we have a $300 thousand dollar mortgage".

The next morning Jimmy's parents woke up to find Jimmy's suitcase packed up, and Jimmy waiting by the front door.

Jimmy's dad asked "What on Earth is going on here son?"

Jimmy replied, "Last night when I was in bed, I heard you and mum yelling. You said you had enough and you were pulling out! And she said she was coming with you. And I'll be damned if you leave me here alone with no bike and a 300 thousand dollar mortgage!"