Jennifer Lopez and Milo Ventimiglia very hesitantly dip their hands in a box with Jimmy Fallon

They were playing Fallon's game 'Can You Feel It?'

'The Tonight Show starring Jimmy Fallon' had the cast of 'Second Act' team up to guess what was inside a box.

Jennifer Lopez appeared on the show with Jimmy Fallon recently to play his game 'Can You Feel It?' The game involves each person in turn, putting their hand into a box to guess what's inside. It's not too far off a Bushtucker Trial, or a task in Keith Lemon's 'Celebrity Juice'.

After Lopez and Fallon both had two goes each, they were joined by her 'Second Act' co-star Milo Ventimiglia - and all three stuck their hands in the box one final time to guess what was inside.

Fallon is hilarious in this - he's quite the wuss. We also just realised something - Americans call smoked salmon, "lox"? Americanisms strike again.

Have a look at the full clip below, and watch out for Fallon's squeals.