Should I invest in GM when there stock is under a dollar?

I was having dinner with someone the other night and they told me that they invested in Shopko when their stocks were low a few years ago. Since his investing the stocks went up and he was able to go in on a partnership with his brother to buy an airplane. I just looked up the prices for stocks in GM and it is like 75 cents. I was thinking about investing minimal amounts of money in their stock, maybe by 20 shares in hopes that they stock will rise again one day. I am wondering if this would be a good financial decision?

Thanks,

Edward
Note: I have never invested in stocks before and would use E-trade or something like that.
 
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