I was on microphone duty as a grad student at a conference that had a crackpot who sat in the front row and asked questions about quark stars no matter the topi

I was on microphone duty as a grad student at a conference that had a crackpot who sat in the front row and asked questions about quark stars no matter the topic of the talk. Unfortunately the chairpeople of the plenaries kept calling on them and I kept having to hand them the mic...