LOL, that's great!
Some years ago, I made a race of goblins who, because they had been left alone an dhad good food, got a bit brainier. Goblins in my homebrew world use poison, a lot, by the way they like alchemy.
These uber goblins had a lot of alchemists, so they created explosives, and then they created a special mind bending drug that drove it's user into a frenzy...
and that's where the goblin satchel charge bomber came from...one ran into a pub with the PCs and blew the place up! Muhaha!
for 3.5 the "Bombers" were barbarians, totally psyched up and hard to stop, they either carried a fire or explosive bomb on their back, and considered it their holy duty to Maglubiyet to wipe out their tribes enemies.
Was a fun but short (due to RL issues) campaign where these little buggers, servants of "black ogres" (ogre/fire giant cross creatures) blew up the main town of a small island like Iceland
Maybe I'm sick, but it's fun seeing players scared of, and running their characters
away from...goblins, hehe!