Me too! I don't mess all the time, but do enjoy it occasionally. For me, it needs to be at least semi-accidentally to enjoy it.
I don't really like just pushing a load out into my pants for no reason, but if I have a genuine need to go, I like to get into my little mind frame of about 10 or so, and become that kid who knows he needs to go, and does plan to, just as soon as he finishes what he's doing. But little me will wait too long sometimes and accidents may happen as a result.
If I'm not in little mode, but have some private time, I will take some chances. If I have gas that needs releasing, I will give a bit of a push as I do so. I won't try to just mess my pants, but a true accidental "shart" is welcome, where just a little follow through occurs. Nothing makes me feel little faster than having a real minor accident like that. It's like BAM! Oh no! I've just pooped myself a bit!
The same when I'm in the shower. If I need to fart I'll just put a little more effort into it and see what happens.
As a matter of fact, I'm about to go for a shower as soon as I finish typing this, and I can feel some gas brewing.....