Vandalism is never a good idea...
However Marvel is encouraging as part of a promotion for Avengers: Infinity War that they've hidden tickets beneath posters.
The poster reads " Do you dare remove Thanos?"
As of right now, this contest is only occurring in Australia, the Disney website confirms that there are posters with tickets behind them in Sydney, Melbourne and Brisbane.
The posters with yellow borders around them are the ones that have prizes.
The prize includes double in- season passes to the film and the giveaway includes a major prize where fans can attend a preview screening event.