I would have to say the first start-up I worked with had the worst recruiters. Albeit they were seniors of mine, and not full fledged professionals, but this was pretty ridiculous.

So at the interview(which I won by winning a hackathon in college), they asked me the standard questions about my current knowledge and what I hope to achieve in the company. When they asked me my tech questions, one program that they thought was tough, I solved in 2 minutes. I was interviewing with 3 other people whom hadn't gotten the answer. Naturally I doubt myself due to the lack of answers being produced. The recruiters themselves didnt understand my answer initially. So much so that they were convinced I was wrong(at this time the others were coming up with, and submitting their answers, which the recruiters naturally expected from us). So to give me the benefit of the doubt, they whip out a laptop to run my code, and guess what? It worked, and had NOTICABLY lesser computation speed.

Needless to say I got the job, but the look on my recruiters' faces after exclaiming I was wrong, then they themselves being proven wrong? Priceless. xD