jìzǔ, sǎomù, jìniàn qīnrén zhè lèi huàtí, bù shìhé suíbiàn kāi wánxiào

祭祖、扫墓、纪念亲人这类话题，不适合随便开玩笑。

Topics like ancestral worship, tomb-sweeping, and commemorating relatives are not suitable for casual joking.