Never deviate from the norm with airport staff.
Stupid people have joked about 'bombs' in luggage, and they get a deep cavity search, and enough questions to miss their flight as a reward, and a reminder not to mess about!
The reason they ask is that, if they ever do find anything on anyone, then straight away they have broken security regs by lying.
You need to get through airports as quickly and painlessly as possible, so go with the flow, and don't get creative!