Susie was $16$ and drunk when she agreed that she would clean Bobby's house every Tuesday for a year if he sang the Star Spangled Banner while standing on his head. Bobby satisfied the condition precedent and stood on his head and sang the Star Spangled Banner. Susie wakes up the next day and refuses to clean Bobby's house. Susie$\_\_\_\_\_\_,$ because the contract is$\_\_\_\_\_\_\_\_\_\_.$