I have lined the bottoms of many pools at many a resort with the towels of many nationalities (mostly German). The thing that I would find most obnozious would be when they would lay down the towels at like MIDNIGHT the night before.
A friend of mine and I returned from a night out at about 5:30 AM and found EVERY chair, lounge, bench claimed by towels. We quietly deposited over 200 in the pool.
The commotion this caused throughout the day was WONDERFUL.