Anvi logic

Santoshi was changing the bedsheets of the bed. Anvi was trying to help in every possible way. After Santoshi was almost done,
Anvi: Now its my turn. Lets change the bedsheets of my bed
Santoshi: We already changed the sheets of your bed 2 days back.
Anvi : ??
Santoshi: You wet the bed - and then I had to change the sheets in the middle of the night.
Anvi : So, mamma, did you wet your bed?


And I was almost rolling with laughter.......