A DTC skincare brand spent $50,000 on Snapchat Ads in Q2, got a reported ROAS of 4.0x, but when they ran a controlled lift test through Snap's own Brand Lift tool, the incremental ROAS was just 1.2x. That's a blind spot that's costing advertisers millions. Lucas and Luna break down why Snapchat's attribution window, view-through conversions, and user behavior inflate ROAS metrics, and how to use incrementality testing — including Snap's own Lift Studies — to get real numbers. They discuss the platform's unique challenges: fleeting attention spans, lower click-through rates compared to Meta, and the problem of delayed conversions not being captured. Plus, a practical three-step framework for brands to run their own lift tests without blowing budget. If you're running Snapchat Ads and trusting the platform-reported ROAS, this episode could save you from a nasty surprise.