We can maybe do not but I think it would not be smart to do this if I must be honest because its not smart to do that at all.
Its possible but I think it gives the bitcoin a bad reputation.
There is no way an ordinary person like us can manipulate the price of bitcoin, actually it will not give any bad reputation on bitcoin in general because a certain bag holders can manipulate the price since they have the privilege to do it, the more you invest the more you have power to manipulate the price so we need to accept that already.