Co worker situation

How should I ask my ex-co worker out?, I only got to say hi once! (keep reading…)? I only worked at this place for a month (I had to quit because of school), I only got to say hi once but I did notice that anytime that the guy came close to my desk or when I went to his department, we’d make eye contact/smile @ each other, BUT he works with about 8 people, they all sit in this little office and make copies, etc.. so basically never had a time alone with him. I have to return the key this friday but once I do I won’t have access to his floor, also, if I do get to see him after I turn why key in, it would have to be after he gets off work, but since I don’t know whether he drives or rides the bus, I can only wait in the lobby of the building, how should I start a conversation?.

Things to consider:

1. his co-workers might be with him when he gets off the elevator
2. I don’t know if he has a girlfriend
3. I only have a few seconds to start conversation with him
4. I only have 2 days left

A friend suggested to fill out a subpoena form and for the title put: Brody & “ME” v. the chance of having a great time

for case number fill out the date of the date

location: where we should go

etc.. then have someone deliver it to him.. the problem is that his co-workers (who handle the mail) see the envelope or receive the envelope, they will all be wondering what it is… and when they find out , (btw, I happen to have some classes at my university with one of them and I also happen to have dated the same guy as one the girls) he might get in trouble…

so any ideas???, how should I ask him out? or make conversation? should I send the subpoena? ideas???, thoughts???