1. make low-effort post
1b. stick around for a bit and stoke the fire
3. watch as the forum regulars don't realize you're gone and continue to fight amongst themselves over basically nothing
Standard knowledge is that trolls are weak against fire, but they actually die instantly from lack of attention. This would've been pretty embarassing if nobody had replied. But 100% of the time, people lack the self-restraint.
"I know you're a troll! ... but let me tell you why you're wrong!"