A lot of people tell me that the worst gift is the toiletries gift set. Technically I think it's second on the list as it's really unimaginative and it was almost certainly bought on a 3 for 2 or in the sales but at least it's useful. My mum insists on buying us each a gift set every year for Christmas despite the fact she knows we use a couple of particular brands of toiletries. I don't know why she does it, she just can't help herself.
For me they're like a "break glass in an emergency" box. Yesterday was that day. We ran out of handwash, I needed to clean the shower and the shower scrubby puff thing collapsed into an untied pouch of plastic. Breaking into the gift set gave me a bar of soap to replace the handwash, a shampoo and conditioner combo to use to clean the shower and a new scrubby bath puff thing to clean myself. Another shopping trip delayed!