Getting more music gear

[quantum]

what would you do to convince people you live with that you need more music gear to practice with? 

Say you played tuba in a brass quintet, but you didn't have your own and had to practice on a pink plastic recorder instead?

[Petter]

what would you do to convince people you live with that you need more music gear to practice with? 

Say you played tuba in a brass quintet, but you didn't have your own and had to practice on a pink plastic recorder instead?

In this specific case I would make as much noice possible with the pink plastic recorder until the patience of my family ultimately ran out, then illustrate how beautiful and soothing a tuba would sound in comparison.