Thanks all! Great suggestions! (Some funny, others we thought about using, but ..)
We ended up going with them opening three envelopes separately and simultaneously that each had a $10 bill. The looked puzzled, then when we asked them to think about it for a second - my daughter slowly started to smile with a look of "you didn't ..." We then told them the date and they started screaming. (Yes, we're proud to have raised three theatre nerds!)
it worked for our kids. I might even try to post the video online later of their reaction.
If if anybody tries a different method - please share how it works!
Note - a side effect is they've been singing various Hamilton songs since then ... ??
Updated On: 12/25/15 at 12:16 PM