Online license agreements usually have warranties that are WRITTEN ENTIRELY IN CAPITAL LETTERS. This is an anachronism from the typewriter era that should be avoided according to the 9th Circuit, a leading author on contracts drafting and the deputy GC of Wikipedia.
The reason why people use all caps is a section of the UCC, an American law that codifies sales law (similar to the Sale of Goods Acts in Canada). You can read more about it here.