Alternating lag
Rare but really annoying form of lag, it gives you anywhere from 0.5 to 1.5 seconds of freeze, and then flips to 0.5 to 1.5 seconds of decent FPS.
So, I have half a second to run away from these blazes, before it freezes me for 1.5 seconds, to so I DON'T experience to full fun of running away from blazes... FUCK YOU TO HELL, Alternating lag!