window shoplifting

when the arcane trickster uses mage hand on an item in the shop's window.
or
you can watch this video Window Shoplifting | Magic for Humans by Justin Willman it perfectly shows it.

Paladin: "Where did you get that?" pointing at the miscellaneous item in the rogue hand
Rogue: "I did a little widow shoplifting"
Paladin: "Don't you mean window shopping?"
Rogue: "Nope, window shoplifting."