It is well-known that the last digits of stock prices tend to cluster at 0 and 5. Existing studies focus on prices with last digits in decimal format and exclude those with last digits in multiples of 5, at most showing 0 is more prevalent than 5. To enhance the literature, this study analyzes the daily prices of the Taiwan 50 index from March 2005 to January 2017 and shows that the last digits have a strong tendency to cluster at 8 in addition to 0 and 5 when the last digits are presented in decimal format. In particular, we show that the last two digits tend to cluster at 80 in addition to 00 and 50 when the last digits are set in multiples of 5. Moreover, the tendency of clustering at "X0" is always larger than "X5" in the latter case. Hence, we provide further evidence supporting the cognition-limit argument for the futures market by Kuo, Lin, and Zhou (2015). We provide theoretical, policy and practice implication based on the results.