You're running down a corridor in a castle that's under attack by terrorists.
Why would terrorists want to blow up a castle, you start to wonder, but your musings are cut short. As you round the corner, you bump into not one but three of the fortress-hating fiends. No problem - you're carrying an AK-47 which you picked up from the corpse of one of their buddies. You open fire, and two go down, but the third turns on you with his handgun.
Luckily, this castle is full of huge wooden crates, and you manage to duck behind one. He's out of ammo - but so are you. You desperately try to reload. Just before your new clip is in place... the experiment ends, and you're taken out of the MRI scanner.
This was what it must have been like to take part in an fMRI study just out from ...