Because Chris Bull and Phoebe Baker are taking part in the world's first tightrope wedding - and this dress rehearsal gives us a glimpse of what it will be like!
Chris, 37, is a professional tightrope walker but Phoebe, 25, only did her first high-rise walk four years ago.
Yet on Friday (1 May) the pair will tie the knot almost 100 feet in the air at the Wookey Hole Caves in Somerset.
Luckily for their guests, they're allowed to watch from the ground below.
We really hope they don't have a shaky start to married life!
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