You thought Thad was full of it when he was listing his skills, ones he mastered quickly and slowly over a few days.  You told him how was exaggerating with at least half of what he was bragging about.

Thad decided to prove it to you, you mockingly suggested he demonstrate Viola...

He narrowed his eyes speeding away returning with the instrument.  He closed his eyes and performed in front of you. Playing not only at a prodigy level but above it.

"Satisfied?" He asked after  dropping it on the ground carelessly crossing his arms " Or are you too busy trying to pick your jaw off the ground?"

\\\based off that line in Justice League