冇咁大個頭，唔好戴咁大頂帽 [－－－个头－－－－－－顶－]

Jyutping mou5 gam3 daai6 go3 tau4 ， m4 hou3 daai3 gam3 daai6 deng2 mou2
Pinyin mǎo gàn dà gè tóu ， wú hǎo dài gàn dà dǐng mào

Definitions (Wiktionary)
  1. proverb, Cantonese
    if you can't stand the heat, get out of the kitchen
    (syn.) 沒有金剛鑽, 没有金刚钻, 别揽瓷器活, 別攬瓷器活