巧 + 了
巧 (qiǎo) is an adjective meaning "coincidental" or "what a coincidence." It is often used as an exclamation — 巧了 (qiǎo le) or 真巧 (zhēn qiǎo) — to express surprise at an unexpected and fortunate coincidence.
真巧,我们竟然坐同一班飞机!
Zhēn qiǎo, wǒmen jìngrán zuò tóng yī bān fēijī!
What a coincidence — we're actually on the same flight!
太巧了,我刚才还在想你呢。
Tài qiǎo le, wǒ gāngcái hái zài xiǎng nǐ ne.
What a coincidence — I was just thinking about you!
这么巧,你也喜欢这部电影?
Zhème qiǎo, nǐ yě xǐhuān zhè bù diànyǐng?
What a coincidence — you like this movie too?