Two ladies on their way home from a night out have to stop for a pee in the grave yard. With no tissues in their pockets one decides to use her knickers and then throw them away, the other used a ribbon of a wreath on a nearby grave. The ladies do what they have to do and go on their way.

The next day the two husbands meet, one says to the other, 'they must have had a good time last night mine came home without her knickers'
The other replies,

"I'll say, mine had her knickers but there was a card inside reading,
with regards from all the lads at the fire station, we'll never forget you"