It has happened to a few of the really low priced shit coins. could just be some pump and dumps or it could meant that there are people getting ready to put some good money into the market. In my opinion bitcoin is still to high to make good profits on but you can grab a shit coin for less than a penny and munipulate it up to 2.5 cents and you have turned your investment into 3 times profit. To do that with bitcoin you would need to invest $6000 and hope it climbs to $18000 in a week. What way would you go? I am going with shitcoins that will go to over 100x profit once the big coins take off again.