This matches what I was going to say. One of the biggest surprises for me, watching the show, is that the miniature bombs we see in movies aren’t really all that practical in reality. The James Bond fountain-pen bomb, for example, goes off like a really big firecracker; it makes a loud pop but would hardly represent a danger to anybody other than the person holding it. If it were inside you, it would hardly do more than ventilating your gut, and spraying gore on people in your vicinity.
In order to produce a substantial bang, the explosives experts hired by the Mythbusters have to employ surprisingly large devices; you’d need even more material to make a blast big enough to (a) escape the body and (b) then do additional damage to the surroundings. I suppose it’s not outside the realm of possibility that a small coffee can could be hidden inside the body somehow; presuming long-term survival is not a concern, you could live without your stomach, say, for a couple of days. It seems really unlikely, though.