Reductio ad absurdum is also known as "reducing to an absurdity." It involves characterizing an opposing argument in such a way that it seems to be ridiculous, or the consequences of the position seem ridiculous.
"孔乙己刚用指甲蘸了酒,想在柜上写字,见我毫不热心,便又叹一口气,显出极惋惜的样子。"