The only drawback is that don't forget to take your drops for contact lenses or else in those long hard days of sitting for a match or taking out a rally can make your eyes tire so be careful not to dehydrate your eyes and keep them fresh and show your patriotism all way through. You may not want to try this wacky experiments alone so do take a pair of contact lenses for your friend as well or a more better idea would be to invite all your friends to join you and this time when you go for a match you all friends wear the flag of your country and also show your team work. At least there will be more supporters of this way of showing your patriotism and one would not look so outnumbered.