Ominous signs

Since arriving back in San Francisco, I've had a series of unpleasant incidents that makes me wonder if I've outstayed my welcome in the bay area...

First, a silly episode at the customs counter.
Characters:
1) Balding, grumpy-looking official
2) Me

(Official stamps a visa expiration date that is 10 days after my visa expires)
I was curious why and didn't want to get him/me into trouble, so I asked why.

[Me]: Why's the expiration date 10 days after the date on the visa?
(He is silent for 5 seconds and gives me a scathing glance)
[Official]: Good question

(At this time, I still hadn't realised that he was mad and being sarcastic, but I thought something was wrong)

[Me]: *silently berates self for asking the wrong question at the wrong time*
[Official]: (frosty tone) What is your occupation?
[Me]: *relieved, thinking this is normal question* Um... I'm an electrical engineer.
[Official]: Do people question your ability as an engineer?
[Me]: *finds the question strange and tries to analyze it, but still unaware of his true intent* Errr... not really.

(It dawned upon me that he felt threatened by my question! *oops*)

[Official]: (curtly) No? Then you should not question other people's ability as well. These extra 10 days are for you to pack up and go home.
[Me]: *not going to fight this one* Sorry...
[Me]: *not pleased* Well I was worried I would get into trouble...

(Anyway, I decided it was pointless, and I took my documents and left, not wanting to give him any excuse to put me on the terrorist watchlist or something.)

Ass. Maybe he wasn't happy about working on Sunday or something. Maybe he felt insecure or something. Anyway, it bothers me and I can't get his sarcastic tone out of my head. Ass.

The other thing that happened was a large pebble flying out in a nice little arc (like those in high school physics) and dealing a sharp blow to my windshield as I was entering the freeway, leaving 2 nice spidery cracks. How random can it get?!!

I wonder if this is a sign...