Gender surprise for hubby??

Be
So we have our 20wk scan next week and we are going to ask our sonographer to write down the gender and stick it in an envelope so we can look at it later....
We don't plan on doing a gender reveal as we don't want anyone else knowing but us. 
I was thinking of peaking at the envelope while hubby is a work and then surprising him when he gets home with our own "gender reveal"! 
Or just a little set-up so he walks in and sees what our baby is as soon as he is home.
Any suggestions or ideas??? I want to make this a really nice surprise for him! 
(It's our second and we didn't find out with our son until birth, so this is new for us lol) 
TIA! 

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