Go here to request a coupon for a free Kinder Bueno milk chocolate bar at participating retailers. I checked the list and it's huge, so chances are good you have a local spot this is valid at.
The fine print says that coupon request must be completed by 12/31/24, so I imagine the coupons themselves expire a few months later.
I ate so many of their Kinder chocolate eggs when I was little, I'm fairly certain I could build a bridge to Mars with all the leftover wrappers. Sure, there's no oxygen in space, but I can hold my breath for a really long time. Watch this!
*takes deep breath*
. . .
*gulps for air*
Did you see that?! I held it for at least 10 seconds! Pretty impressive, huh?