I always forget how much I love this ep. It's not 'important' to the over all arc, but it's the first funny ep spn does. It introduces the Prank Wars, it introduces the Hell Hounds/Ghost Facers (who I *love*!), and it's just chock a block full of adorable Sam and Dean interaction.
Not from Hell House ep:
'what makes you so sure?'
'because i'm the oldest, which means i'm always right.'
'no it doesn't!'
'it totally does.'