How you know when you are a professional blogger

No, it's not when you start making money out of advertising. It's when you mind works like this:
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(Scene: House, mess, children, dinner time.)

Daughter: Mummy, I need to take a backpack for my school-outing tomorrow. Can I use Joseph's?

Mummy: No, Joseph needs to take his one.

Daughter: But I don't have one then.

Mummy: Don't worry, you can use daddy's.

(Later, at 9pm, after kids in bed, TV on).

Mummy (thinks): I could make a backpack. A cute, girly one... no don't be silly it's too late.

Voice (in Mummy's head): But if you made it, you could do a tutorial on your blog.

Mummy (thinks): That's true. It would make a great tutorial. But really, 9pm? To start making a backpack, from scratch?

Voice (in Mummy's head): Yes, but you're getting good at this whole craft, sewing, blogging thing. I bet you could do it!

Mummy (thinks): And there's that great fabric I found clearing the cupboards out. With the pink checks and butterflies.

Voice (IMH): You see! It's a great idea! And just imagine the great photo!
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It's over for me. I made the backpack, and my daughter wore it proudly this morning for her school trip. If you don't believe me, check back tomorrow for the tutorial.