prank war with SO !?just for fun!

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So my SO and I have this ongoing prank war it started small like throwing a bucket of ice water on him while he was in the shower . So today I was in the shower and my SO came in and threw cold water on me and a ton of flour - which stuck in my hair and was a pain to wash off. I need to come up with a better prank !  We love doing this bc it keeps us laughing and takes our mind off ttc ! And I love to see his face when I get him back lol 
Do you and your SO play pranks on each other? 
What pranks ? And any ideas!!