My dad is mentally unsound.
For the past 3 days he kept asking me "did you see my Singtel bill"?
When my maid open the letterbox he also asked "did you see my Singtel bill"?
Everyday untill today he also ask me "did you see my Singtel bill"?
A moment ago he said he is going to call Singtel asking about the bill.

Don't understand why he so eager to pay his bill.