无理取闹无事生非无中生有
[wú lĭ qŭ nào wú shì shēng fēi wú zhōng shēng yŏu]
It literally means causing trouble out of nothing, making disturbances without reason, or creating something out of nothing. Often used playfully to express being silly, naughty, or mischievous. The person may like to have fun in an unexpected or unreasonable way.