Opportunity knocks but once. Unless she really, really wants in.
Actually, Opportunity just sits outside the door, scratches at it a bit, and cries until I unlock the door and let her in.
Opportunity was my stupid cat.
But I didn’t open the door soon enough one day, so we lost Opportunity.
She moved in next door. Now we don’t have to feed her any more.

Easy   Medium   Hard   Tough