Everyone makes a mistake once in a while. Here are 8 of them dealt with by Tango Space. I particularly like:

Leaders do this by making eye contact with the leader of the couple arriving towards us. Once their eye have met yours (mirada), you can do a head-sign (cabeceo) towards the dance floor, so that he/she understands you are about to start dancing.

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Better that than falling all over the place! Check it out!