It really is amazing how ordinary some of these things are. I am wondering how you get through life without ever having worn white knickers. My list otherwise has a few things that have been already mentioned and some of which I agree are totally unnecessary
I have never smoked. Anything.
I have never broken a bone.
I have never been in a hot air balloon
I have never worn jewellery, except a wedding ring for a very short time (I'm still married but can't bear the thought of metal on my skin)
I have never had a Jaegerbomb
I have never had a daughter (this is, obviously NOT in the "unnecessary" category)
I have worn white knickers but I've never worn any Ann Summers stuff.