Four strange verses

The beginning of Genesis, chapter 6, are some of the strangest verses I've ever read.

And I haven't even read the entire Bible cover to cover yet.

Verses 1-4 tells the tale of how mankind spread across the globe, and that the angels saw some of the beautiful women and took some for their own.  It was at this point that God limited our years on earth to no more than 120 years.

Then, verse 4 concludes with: "In those days, and even later, there were giants on the earth who were descendants of human women and the heavenly beings.  They were the great heroes and famous men of long ago."

Verses 5-8 then weaves the tale of man's wickedness, and how God was going to wipe them all out.

All except Noah.