What can I add to a cinema voucher?

[babystep]

Buying cinema vouchers for my mid- late-teen nieces and nephews this year. What can I add to make it a bit more fun to open of the day? Novelty sweets to take with? But would teens think that a bit lame? (own kids much younger so feel v out of touch)
Vouchers are 20 each so hoping to spend around 5 more per teen, can stretch a bit if needed

A big slab of chocolate to wrap up with sounds great. Almost anyone would be pleased with that.

Could you wrap it in several layers and put some sweets in between each.g small chocolate bars? Just for fun.
Or go to Primark they used to do small bags with initials. When I got DD’s tickets as a present I bought a bag with her initial and put tickets there.

Chocolate or big bag of popcorn would be a great add-on.

yes, agree with PPs a big bar of chocolate will be good as well.

I'd do a bucket of popcorn with the voucher on top and wrapped in cellophane. Maybe a bag of M&Ms or something thrown in too