"Do you blow things up?"
...wait, this one is also true 😛
But in all seriousness, I think the biggest misconception about doing research is that people think it's easy to find a job, and that you make a lot of money. Both of which are completely false. One, I can barely find a job, so I'm doing some sort of internship that is paid below minimum wage, and two...well I'm paid below minimum wadge, and I work unpaid overtime almost every day. Sure, in 30 years from now I might make a great salary, but getting there is a lot of hard work. It's a lot of dedication, and very little rewards. Because as it happens, usually a lot of the research we do doesn't really work that well. That's why one project, or even one aspect of the project, can take years to achieve.
And then you have those assholes who claim that we've already found the cure to cancer and that were withholding it to make more money. Newsflash people, scientist don't care about the money the pharmaceutical industry makes, because we don't see a dime of it, so I guaranty you if someone found the cure to cancer, it would be all over the scientific community (actually, companies hate working with us because we don't care about the money, we care about putting our knowledge out there). Or you have those that believe vaccination is useless and it gives you autism or some type of other non-sense. It's really frustrating dealing with those people and trying to explain how vaccines actually work.