As is so often the case , we first directed to the " pop - rivets " , and then got the " I have n't seen those in ages " treatment from the assistant . We bought some flat headed nails and washers to fit them , which is a substitute that I ' ve used in the past . We were also picking up some computer parts , but when we arrived at the shop , first there was a problem with the payment which was quickly resolved ( we were just collecting not paying ) , then the parts were not in the shop ! Whilst waiting , we went across the road to a Thai restaurant for their " set lunch " .

Question: What 's a possible reason they bought some flat headed nails and washers ?
Answer: Because they have n't seen those in ages .Because they were also picking up some computer parts .Because they needed to build or repair something .None of the above choices .