The first time I started leveling a hunter, I got my tame beast spell. I then (being a stereotypical night-elf hunter, lol) thought that I could tame anything.

So I remembered that those harpies I saw could shoot fireballs! And I decided to tame them. After 15 mins of trying, I found out about 'beasts', 'humanoids', etc


Or the other time I tried getting a quest item to drop, and after 2 hours I realized I forgot to turn the earlier quest in....