Hung up in his home is a glass-framed letter from President Chiang Ching-kuo of the Republic of China, which reads: "I would like to congratulate you on the ingenious devices you have created. They provide both education and entertainment." As well as being an inventor, Liu is a nature lover who spends his spare time climbing mountains and diving off the seashore.
他常以宏亮的聲音調侃自己：「你知道，我剛出生時，父母準備把我送給人家當養子，結果因為『太醜』給『退票』了」說完又是一陣豪爽、開朗的笑。