At least, I think it was only three...

An intelligence test for people with two mobile phones:

Step 1. Use Phone A to call Phone B (perhaps, to test that you haven't broken it), then promptly forget all about this.

Step 2. Some hours later, discover a missed call on Phone B and try to return it.

Step 3. If Phone A should happen to ring while you're trying to do this, mutter in irritation, hang up, and try to answer it. If whoever was phoning has rung off try to call them back.

Repeat steps 2 and 3, getting ever more exasperated, for as many times as it takes you to suddenly feel very, very foolish indeed.

Scores:

1 repetition = Intelligent enough, though perhaps slightly more than averagely forgetful.
2 repetitions = Consider whether your ambitions in life might not be realistic after all. Or better still, ask someone more intelligent to do it for you.
3 repetitions = Try to laugh off your own alarming mental deterioration in the form of a dimly humourous blog post.