Hi, if a cheque bounces it is sometimes re-presented to the bank for payment, this usually happens if the bank can see that the money to honour the cheque will be in the account over the next few days.
However, if the bank can see no sign of the cheque being paid, they will send it back stamped "refer to drawer". If you ask them about it, the bank will tell you to take the cheque back to your 'friend' and ask for cash.
I have recently been written some rubber cheques, I'm actually waiting for another one to clear right now.
If I lent money to a 'friend' and had trouble getting it back, I'd strike them of my 'friends' list, pay a visit to their house and borrow a few valuable items from them.