I once did that. I borrowed from a friend to trade FX and in less than a week the whole money went down. My friend understood my plight when he found out what happened and didn't bother me about it. Years later when I was able to repay him, he said he didn't want it anymore but I insisted he took the money. He reluctantly accepted half of it when he noticed my persistence.

Looking back now, I wouldn't do such a thoughtless thing. I rather save up the little I can to start trading. Back then I thought small capital couldn't trade and got successful. That's not it. I've had situations where I funded with less than $30 in the same FX I felt anything less than $200 wasn't sustainable and still made something out of it.