Marking The Spot

Two blondes rented a fishing boat, and were having a great day catching fish.

The first blonde said:

- This is such a great spot, we need to mark it so we can come back.

The second blonde proceeded to put a mark on the side of the boat.

The first blonde asked:

- What are you doing?

The second blonde replied:

- Marking the spot.

- Don't be stupid - the first blonde said.

- What if we don't get the same boat next time?