I am a beast with the flare gun but lately I've been going old school and using the shottie.
Also, as a side note: Spamming suggestions for new Sniper unlockables (jars of earwax, jizz, toenails, poop, tears, etc.) is so much fun.
EDIT: Quite an odd series of events here. I hadn't played Spy in ages and thought I might as well, so I got on an Arena server and started getting brutalized. I decided that I should use my Dead Ringer, so on my next "death", my "killer" decided it'd be cool to taunt over my "corpse". I go up behind him, de-cloak, and backstab the mofo. To show my superiority, I taunted over his corpse. However, just before I finished my taunt, a Sniper came up and Kukri'd me to death, and I got a nice shot of the Sniper solemnly removing his hat on my killcam.