The Financial Brand has posted 15 examples of guerilla marketing (not to be confused with gorilla marketing) by banks around the world.
The examples include some creative mailings, public installations and random acts of kindness. My personal favourite is from the credit union  that randomly gave out $50 notes instead of $20 notes around Christmas in 2008.
It was only a small campaign run for a single ATM, costing $3,000, but you can imagine the word-of-mouth effect this would have for those who got a $50 note instead of the requested $20.
Can you imagine any of our high-street banks doing that?
View all of the guerilla marketing campaigns at The Financial Brand.