Ogilvy said something about this. Roughly, he said it's easy to get attention -- just show a picture of a guy standing on his head. However, you had better immediately follow up. Explain how the pants the guy is wearing keep keys, wallets, etc from falling out. Otherwise the reader feels you're trying to trick them.
Another company ran an ad "A Submarine That Can Fly?" Good trick -- it grabbed attention. But then the body read "Well, we don't actually have such a submarine, but..." Nobody hung around long enough to find out what the company really offered.
Attention isn't the problem in the AIDA formula -- it's Interest, Desire, Action.
If you're looking around for attention getters, give your offer another look. My guess is the offer isn't attention getting, interesting, or desirable enough. Like the movie which can't live up to the hype, any working attention grabber has to follow up in the body. And that's where most letters fail, not the outrageous headlines, blinking text, or other obnoxious gimmickry.
The Amazing Formula letter has most of the techniques mentioned. Copywriters believe these techniques work, but here's the catch. You can't make bolding and highlighting work unless you have
important ideas to draw attention to. The saying goes the fastest way to fail is to have good advertising for a poor product or service. Highlighting and bolding is too often going to allow the reader to figure out how poor the offer is that much quicker.