老鼠拖木锨，大头在后头
lǎo​shǔ​tuō​mù​xiān​dà​tou​zài​hòu​tou

the best is yet to come

老鼠拖木锨，大头在后头 老鼠拖木鍁，大頭在後頭 lǎo​shǔ​tuō​mù​xiān​dà​tou​zài​hòu​tou
the best is yet to come
Literally "when a mouse drags a wooden shovel, the big head is at the back"; means that the most significant part of a situation or the most serious trouble is still to come.