<human>: Can you provide a brief rundown of the text in within 3 sentences?

This happened on Thanksgiving (Reporting from Canada here...) and after dinner my girlfriend and I decided to get Starbucks before I drove home.

While in there we were talking about dinner and joking about her cousin who enjoys poking and prodding people (he's 15). I jokingly suggested that I should just go up one day and fake slap him to scare him, at which point my girlfriend said that if you drama slap someone it's all in how the person who is being slapped responds.

So she shows me how you do it (without actually doing it because public place and all) and like an idiot I line my left hand on her check and slap it with my right. The sound is AW(depending on your perspective)SOME/FUL. Seriously, the sound would have made Marshall Eriksen proud and Barney Stinson's Sphincter tighten. It fills the Starbucks. The barista who is making our drink looked up at just the right time to see my girlfriend react (which was superbly done, face went to the side, everything) and she looks shocked, people at the back are cocking their heads to the side to see what happened.

At this point I look around because I feel that overwhelming force of eyes on me. I know I fucked up. The only thing that saved me is my girlfriend has a huge smile on her face, then realizes also what happened and starts laughing because between the look of "oh shit on my face" and the barista's look of "do I need to call the cops" she just laughed. Finally composing herself she looks at me and says, and questions why she takes me out in public.
<bot>: Stage slapped my girlfriend in starbucks, barista looked like she was ready to call the cops, girlfriend saved me and laughed it off though.