Post travel: doesn't play well with others

You know that way you feel when you're back from vacation and feel a bit hungover from the travel, grateful for the experience, fatigued from the process, sheepish about getting back to the grind, excited to download and view all the photos you took, overwhelmed with the thoughts of all you need to get done before the whirlwind begins again on Monday? You're feeling quiet and slow and introspective.... and tired. 
And then you make the necessary trip to the grocery store and get Mr. Chatty McChatterson at the *self-help* register - which you chose because you knew your people skills would be lacking today and felt a responsibility to mankind to remove yourself from any situations requiring small talk. And while you're getting incessant questions about your weekend plans and "what are you going to use these mangos for?" inquiries intermingled with repeated attempts to be witty, you just KNOW he has the best intentions and is also trying to fill his hours at work with warm experiences, and you are SO APPRECIATIVE of people like him, BELIEVING in it being our jobs as humans to spread kindness and make someone else's day better too, but REALLY wishing your choice to scan your items and pay on your own were met with a friendly but distant "Hello, let me know if I can help while I stand way over here pretty far away from you so you don't feel obligated to fake your way through a conversation"? You know that feeling?
I cannot be rude to innocent bystanders no matter what kind of day I'm having because it will haunt me for all my days. So I focus on my go-to response... the one where I look for the positive in the situation so I can adjust my attitude. And now as I look down at my sweet potatoes, I realize that if I don't look at him while he talks, I picture Oscar the Grouch because HE SOUNDS EXACTLY LIKE HIM!! And Oscar the Grouch, who is still making a comment about each of the items in my cart has just told told me that he should eat more leafy greens and, seeing my box of cat litter, has just told me I forgot to get snacks for my cats. And now it's all actually funny. 
His mission: accomplished. Just maybe not as he intended.

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