One is the smallest man in the world, the other is the woman with the longest legs and the instructions from the former to the latter when they met this morning: 'Don't look up.'
At just 29.37in tall, He Ping Ping's little head barely reaches Svetlana Pankrtova's knees.
But then, her legs do go on a fair way - measuring 51.96in long.
At 6ft 7in from head to toe, Pankratova is well short of being the tallest living woman. That honour goes to Yao Defen, who stands 7ft 9in.
But the Russian's relatively short body means that those pins are the longest ever recorded for a woman.
An impression she seemed keen to emphasise this morning by wearing what appeared to be the world's shortest skirt.
Not that He Ping Ping seemed to mind, happily posing underneath Pankratova's legs - and he even had a sneaky look up.
The 20-year-old had jetted in from his home in northern China to help launch the latest edition of the Guinness World Records Book in Trafalgar Square, Central London.
Craig Glenday, the book's editor, recently told the Daily Record newspaper how much he enjoyed his work.
He said: 'It's a great job, and there's so much travel involved. Earlier this year I did my own world record for travel, which was 44 hours non-stop.
'I was in Inner Mongolia meeting He Ping Ping, the world's shortest man (74.61cm) who actually lives quite near Bao Xi Shun, the world's tallest man (2m, 36.1cm).
'I was on my way, via Paris, to Chile for a flight to Antarctica with the band Fall Out Boy, who were trying to set a record for the shortest time it would take to play on every continent in the world.
'Unfortunately the weather was so bad that we couldn't make it in the end.'
The Guinness World Record Book is out tomorrow.