Ad agency M&C Saatchi has come up with a rather dubious but clever way of marketing LG's G2 smartphone. Its banner ads sense your own handset and will taunt its shortcomings while suggesting, naturally, an LG G2 instead. For instance, an HTC One-based ad suggests that you'll get 30 percent more battery life with a G2, while an iPhone version touts the LG's larger screen. The Sweden-only ads may rub brand-loyal types the wrong way, but as an attention-grabbing device? LG does know trolling.