Haha XD
This will be fun.

Not totally incredible though. I have some BAD experience on the contrary: I once paid a metro/underground ticket with my mobile phone and got a fine as "ticket-less" travel and the reason was that my phone time was few minutes wrong. I worked all the ways to claim this in court as far it was free but I lost the case and did not want to spend money going higher in court

So be careful with mobile apps