Intentionally telling people incorrect respawn times for the glacier bear placeholders in everfrost for totemic helm. They'd show up, not see anything, and think "shucks somebody else must have gotten it".
Also training people in dreadlands by getting a bunch of mobs and then running to KC really high in the air using lev with the mobs trailing, and nobody who got trained had any idea who did it. It's like training with invis, without the risk of somebody having see invis on.
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