This batch of "bulletproof" coffee mugs is, uh, probably fine. The manufacturer is still working on the bulletproof part.
Features: 99.99% likely to not shatter upon impact, contains 1.01% chance of shattering into a million tiny pieces. Warranty: void where prohibited (i.e., anywhere with actual laws).
Side effects may include: spontaneous combustion, temporary blindness, or an inexplicable urge to drink more coffee.
Read reviews from actual customers who may or may not have been bribed to say nice things.