5. Being a stupid, illiterate jerk.

4. What, can’t you read?

3. Seriously, are you fucking illiterate?

2. Do we look like the kind of store that sells “I just called to say I love you”?

And last but not least…

1. The Internet (probably)

related: Our customers are always right…except when they’re wrong.

extra credit: thanks, mr. hipster