Using checks in the supermarket

So I was in line behind this sweet old grandma today in the checkout line, and it was bad enough that she had a thousand people behind her, but then she busts out this old gem:

People still use checkbooks? At the grocery store? Really? Her purchase was like twenty dollars, has nobody told her about check cards? That seems cruel.

Now this alone would only have been mildly annoying yet tolerable, but she had to:

• Get out her purse
• Remove her checkbook
• Open it
• Get a pen
• Flip to a blank check
• Begin writing it
• Double-check the amount
• Sign and complete
• Tear it out
• Have it processed by the cashier who clearly had never seen a check before in her life

Are you kidding me? 

Okay, I understand, you're an old woman, you live alone, nobody helps you, life is hard. But can you really not make out a check with a blank amount signed to the store before you leave the house? You have to spend two minutes holding up ten other people?

Old age is no excuse for inconsideration.