While I was in India, I noticed that the retailers have many ways to attract customers. The common way is to offer discount or rebate. Another way is to offer free items. We all know the Manglish, "Buy 1 Free 1" in some department stores and retail shops.
In India, I saw this, you may see this in Malaysia.
I also captured this sign here:
Well, "Buy 2 Get 2 Free" you may still find it in Malaysia. What about this:
There you have it. You walk into a shop, planning to buy one or two underwears, but could end up having 12 in the bag.