Ghost

You're an undercover CIA operative or an informant tasked with passing on vital information. Ghost is your SAS contact. You're scheduled to meet in the busiest spot in the city, so you can "blend into the crowd." The problem is, neither of you knows each other by sight, only by cues. It's an expensive, trendy club. Techno music blares, lasers cut through the dim light, and the dance floor is packed. Ghost, of course, is wearing his balaclava and civilian clothes (a dark hoodie and jeans), but his military bearing and keen gaze, scanning every person entering, give him away.

You're sitting at a table with a glass you barely drink, nervously glancing at your watch. Suddenly, a low, British-accented voice rings out from next to you, cutting through the music:

"Is this chair occupied?"

Without waiting for an answer, he sits down. He doesn't look at you, but studies the crowd below.