The new contaminated 12.7mm round got me thinking; we find toxic sludge barrels but they are never an environmental challenge like other exploding barrels (except when they are surrounded by gas I guess), you only get toxic sludge from them. However, we find napalm barrels but can't get napalm from them. That's inconsistent. Anyway, toxic barrels you can shoot that start putting out toxic gas like a grenade (but maybe instantly?) would be cool and dangerous, and the usual suspects could throw them (and a hit would deal bio damage like a contaminated round in addition to creating a cloud).
