Your instinct will be to flail. Don’t. Flailing turns you into a noisy, unpredictable monster, and wasps interpret that as an attack. I once saw my roommate do the "spider dance" at a wasp, and the thing got so offended it flew straight into his coffee mug.
Stand perfectly still for ten seconds. Pretend you’re a very fancy lamp. The wasp will likely lose interest and land on a window or a wall, giving you the tactical advantage you need. This is your only chance to grab your tools without creating a crisis.
Tool Selection: The Soft Ambush
Do not reach for the vacuum cleaner. That’s like using a tornado to put out a candle. The buzzing sound will terrify the wasp, and you’ll have a ticking time bomb trapped in a plastic tube. Instead, grab a clear glass or a plastic cup and a stiff piece of cardboard (like an old birthday card or a notebook cover).
The trick is gentle confidence. Approach the wasp slowly, like you’re trying to take a selfie with a grumpy celebrity. Hold your breath if you have to—they can smell fear, or at least your breath, which is basically the same thing. Place the cup over the wasp with one smooth, decisive motion. No hesitation. Hesitation is what gets you stung.