Is it normal for my friend to randomly started acting this way?

Tourettes syndrome... Google it.

Hmm, sounds like his having an emotional turmoil inside him. You should say your worried about him.
Before he does anything crazy!

quick update...He has no idea what happened that day is what he claims to say...

sounds like he has bad wiring to me, steer clear of him.

Either something really bad happened that day or he's on drugs

He didn't really answer my phonecalls and won't reply to my emails i haven't seen him ever since that day

Hmm, that's odd. It depends why he acted that way. Maybe you should ask him?

He's flipped!

He probably just had a bad day. That's some way to act but sometimes I feel like doing that. He just acted on his feeling.

This sounds like a thing that I would do; we might both have similar personalities. Sometimes I can get so much tight knit balls of stress that if can be released in seemingly random emotional outbursts. He might be the kind of person, like me, who does not technically control his emotions, but tries to ignore them. This might lead to an immature development of emotions, so that if the wall barricading himself from his natural emotions breaks, all hell can break loose and he may have a fit that just has to get out, which is beyond his own logical reasoning. He probably suddenly apologized because of his natural consideration for them, and he didn't really mean to be so insensitive, though it was the only way he could release himself.

This might explain to why he thinks his mind isn't right, because he could just be in a very stressful situation to where he's in an emotional state and can barely reach logic to make decisions. This may seem random to the observer, but it may probably be because that how discreetly he hid his feelings from others (and possibly himself), which led to the outburst.

To why he seemed normal, his climax of emotions probably happened the moment he started yelling, to where he slowly calmed down. His childlike decisions under stress imply that he has very basic emotions, which tend to cool off faster.

ALSO, this is all completely a spew of my own theoretical concepts based almost entirely off of my own personal experiences and my Myers-Briggs personality type INTP, exploring the Fe shadow function.

It might help if you look up his Myers-Briggs personality type and find the fourth shadow function of his type to find some ideas about his type's behavior under stress.

Well first of all how long have you known this guy?

That really isn't normal at all. Maybe something bad happened to him if you've known him for a while or he might possibly have a disorder of some type.