Does my kitten sees things that I don't?   He has been living with us
for a week.

He would be mellow, exploring around then suddenly give a short grunt,
he will run and hide and then come out and trying to pounce around the
corners thinking something (imaginary prey?) is there, he even tried to
pounce on me while was on the bed.

Sometimes I see a reason as he was checking out my computer wiring and
then the wire moved and spooked him out, at other times there is really
no reason that I can see.

Is it normal for cats to just change mode from normal to "crazy"?   Am
I doing something that frustrates him?   I think maybe when I didn't
give enough play time to wear him out he might tend to have more of
these episodes.

When he does this jumpy thing, I try to completely ignore him because
he would usually run at full speed and hide if I alert him some more.
But I am afraid he might get more aggressive towards me?

Thanks in advance