Balaclavas? Didn't they go out with 1960s Michael Caine movies? The gang that stole another version of the "Scream" in the early 1990s showed a much greater sense of post-modern irony:
"That infamous theft involved a ladder run up against the wall of the gallery at night, a shattered window pane and a picture postcard - featuring three men laughing uproariously - left on the wall inscribed with the message "Thanks for the poor security". At the time the painting was estimated to be worth £48m."