1-Healers going full dps and forgetting to heal party more than once.
2-Tanks doing a eff huge pull when they're not able to hold aggro/take damage for that second.
3-People going "OH LOL all my gear is broken but who cares"
4-3/more wipes at the same point, specially if coupled with the "LOL f*** gear" from above.
5-Constant afkers