This pic isn't in focus enough to be included in the plant database, in case anyone happens to want my opinion, but if you just wondered what you saw, I think it was artillery fern:
Artillery Plant (Pilea microphylla)

Knowing how you love the other Pilea, baby tears, I can see why you were interested. I have bought houseplants I already had before because there was an artillery fern in the pot too. Wish I could get one to stay alive longer.