meeting people from a fish store

lol wow, yeah im thinking the "hey wanna check out my fish some time?" angle might work
 
Just remember that these things are like a negotiation.

And in negotiations you start high, the other person starts low and you meet somewhere in the middle.

So you be as forward as possible, she comes back with a slap and a no, you come back with a date and making her breakfast, she comes back with not calling the police, then you meet somewhere in the middle (if you do it right this is a "date", if you do it wrong it is a "restraining order"). Worst case scenario you look for a new store to shop at, which considering this is Petsmart we are talking about...
 
Offer to buy her a fish sandwich.
 
If you don't ask her out its an automatic No so you may as well ask and see if its a possible yes.
 
Unfortunately Petsmart employees are not paid commission so I don't see her having much motivation to ask him out.
 
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