Straddling before the cards are dealt

[Dante1126]

Not 100% sure, but my thinking on this would be that the blinds should be posted before the cards fly and at that time a straddle could also be legally posted. Since the action is legal at that point then doing it even jokingly would be a binding action like all others. However, if you weren't clear on it and players agreed that it was just a joke action then I think it was right of the floor to let you take it back.