The Oops, Men's Bathroom:
1. Go to the Men's bathroom/toilet instead of the Women's.
2. Say you accidentally mixed up Men's and Women's…(By the way ofcourse check out the men present).
3. Wink or make it clear using body language that you want your 'chosen man'. (If you can't find anyone that interests you, repeat step 1 and 2 later).
Bummer: Again, you'll need to be fairly attractive…(otherwise you'll look like a creepy stalker).