Sorry to hear that bud.
Best to always put notes straight into your wallet instead of loose in a back trouser pocket as if like me when you take your wallet out the loose note can come out too.
I remember years ago on an irish ferry crossing it was so rough the wife and kids where all throwing up outside on deck. I went in to buy some water for them and whilst putting my notes away in my wallet just as I reached the doorway to the deck the wind took hold of my wallet and all I could see was notes being blown everywhere and most going overboard. I was gutted to say the least.
It was a rather dry holiday as most of me booze money jumped ship