Not a tale about the tallest, but perhaps one of the largest. I was once a gliding instructor and my club had regular air experience flying evenings. One such evening, a party from the local American air base came over to expereince the delights of silent flight.
One young lady was a bit on the 'chunky side'. A diet of burgers and fizzy pop had not been kind to her physiche. And when asked the mandatory question regarding her weight (for ballast calcualtions - quite critical in a glider and not withstanding the fact she was clearly not going to fit in the thing), she was either very deluded or was telling pure porkies!
When informed that she was too large and heavy to fly, she looked despondant to the point of tears. We took pity and decided that if we put her in the rear cockpit and put our lightest instructor in the front, the c of g would be about correct and the MAUW close if we actually believed her statement regarding her mass.
She loved her flight, but when she tried to get out of the rear cockpit - it soon transpired she didn't have enough strength to lift herself out. Helpers couldn't get close enough to assist due to the rear cockpit being positioned between the wing roots. We considered de-rigging and removing the wings for better access, but we couldn't reach the wing bolts because of her.
Our only option was to tow the glider back to the hangar, remove the canopy, put a strop around her back and under her arms, and winch her out using the chain hoist suspended from the hangar roof!
Despite her humiliating experience, she enquired about membership of the club. Luckily I wasn't around to issue the reply.