What was the teen's graffiti that triggered Syrian President Al-Assad's fall 13 yrs ago?

Around 13 years ago, 14-year-old Mouawiya Syasneh's rebellious act of drawing a graffiti against Syrian President Bashar Al-Assad triggered a civil war. "Ejak el door, ya doctor (It's your turn, Doctor)," Mouawiya had written with reference to Assad's medical background. Mouawiya and his friends were tortured by secret police 'Mukhabarat' and images of the beaten boys led to huge protests.