Ah ha ha! Gets 'em everytime!

My friend told some guy off like that once- it was hilarious. She was convincing too. My mom's name is Janet, hah... sorry, no relevance to the review there, I apologize.

Oop, I just noticed one mistake:

Smirking, Janet reveled in the fact that for once, the annoying interloper didn’t have anything to say.”

Just chuck the " at the end ^.^
Maybe I could suggest to watch out for how you structure sentences with commas. I'm no great shakes at grammer (I hate grammer actually. Spelling is a close second. And writing my own plausible plot that doesn't degrade into fluff is a third difficulty of mine.), but somehow I think some of your commas are a wee bit misplaced. Let me just hunt around here... its not like there's many or anything...

she asked, trying not to snap or roll her eyes, jobs with flexible hours were hard to find.

Maybe a period between 'eyes' and 'jobs'? I don't know myself, but it seems like it'd be two sentences. Perhaps, "After all, jobs with flexible hours were hard to find." ? I dunno, just a suggestion and I don't think there's really any more like it.

Oh and I despise rude customers. I work at a restaurant and hearing waitresses crab about customers is horrendous. I work in the kitchen, but just hearing them makes me take extra caution (like not coming in an hour before they close, piling plates neatly at the edge of the table, not hiding gum under plates, and, most of all, leaving a nice fat tip). Waitresses are very scary people when angered.

Heh, well, great short here, very entertaining! I love how you are completely immune to the 'perfect character' syndrome! I think I still suffer from it.. bah, well, anyhoo, sorry for the ridiculously long review again, great job! ^.^