"Fine.  Yes, I believed your lies until Rarity pointed them out, and yes, I was drinking with AB and Scoots, but that doesn't excuse you from telling them.  Why would you lie about the reason if it wasn't me?  What could possibly be so bad you'd continually lie about it if it's not me?  I want the truth Button, and I'm not leaving until I get it."  To emphasize her point, Sweetie stomped her hooves into the ground and dug them in.