Now this is annoying.

I just walked downstairs to get some drink, and my dad knows that I want to convince him to get a piano. So I walked to the kitchen and then my dad kept looking at me until I went back upstairs. And when I was like "What?" he was like "I'm waiting". :S
I just can't, okay, I can't. I can't convince my dad, I wouldn't know how to convince him at all. I already know that it's going to be a 'no' anyway. My dad's never going to believe me if I'd say I'd keep playing the piano all along and if I'd quit after 2 months, he'd be like "I told you you weren't going to use it for longer than 2 months". And renting a piano and then bringing it back is, in total, more expensive than renting it and keeping it after all, so my parents wouldn't be happy with me at all.
I just don't know what to do. I KNOW I can't convince my dad, but I REALLY want a piano. :/