Not wanting to break any laws...
I am a best man at a wedding and instead of leaving the bride and groom a bottle of bubbly in their hotel room I thought it might be amusing to leave them a blue pill. Up to them whether they use it, and the groom (at least) would probably find it funny.
I have no idea if you can legally get hold of it without a prescription, which may throw a spanner in the works.
Any advice?
P.S Replying to this thread will not mean people think you suffer from erectile disfunction.
P.P.S This isn't a convoluted cover story to disguise my own erectile disfunction. I got over that a long time ago.

