I got a Casio 750 and found that it often got accidentally turned on in the pocket.
Finally it turned on and the lens came out & got jammed. I was able to straighten it out, but it's now my wife's camera. The problem was the little "Camera" & "Review" buttons on the slanted part above the LCD. I think most Casios have these.
For ultra-slim I had for years a Minolta Xt - I really like those & other cameras with the lens completely contained within the camera, Pentax WP series and the Kodak twin-lens cameras have this, too, as well as several Nikons, Fujis, Samsungs etc.
I finally replaced the Casio with a Panasonic TZ1 - kinda large, just pocketable, but I really like the 10X zoom. As a bonus - never saw this in any reviews - the lens does NOT extend if the TZ1 should turn on in-pocket. The lens doesn't begin to extend until one starts to zoom.
Do also consider the Olympus 720: slim, non-extending lens, waterproof, shockresistant. A bit heavy, and doesn't use a standard SD card.
-Erik