Following a bit of good-humoured banter from MC Ali Beal - where I must admit the terror of audience participation reared its ugly head - and introductions from festival director Pitsch Leiser, it was time for the show.
From the first tentative steps of the only woman in the four team line-up, placing her dainty feet on a dozen raw eggs and wobbling along another three cartons, to the jaw-dropping final act, the audience was left gasping in wonderment, puzzlement and astonishment.
Sometimes I found it hard to look - and sometimes it was hard to tell which body part was which - as the foursome seemingly balanced within an inch of their lives.
Each member's muscles tensed and shook as they climbed and twisted up each others' bodies, balancing from heads and walking across outstretched arms. The strength and cool-headed performance of the artists was beyond outstanding.
Just when we thought we'd seen it all, a small table was placed atop four bottles. Two egg cartons were placed on top of the table. A collective gasp could be heard as one troupe member stood on the eggs, another somehow made their way on to the first one's shoulders and, when we almost couldn't stand it any more, another managed to make their way to balance on the very top.
An audible sigh of relief rang out as the three-tiered human tower untangled itself and let the audience process what they had just seen.
The tent erupted into a standing ovation as Casus Circus took their bow.
I left the wonderful Spiegeltent with my head shaking and my mouth hanging open in utter wonderment. That memory will take centre stage as one of my life's all-time favourites.
