You can certainly try

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"You can certainly try" is a phrase often used by Dungeon Masters, especially Matt Mercer, to indicate that, while there is nothing in the rules preventing a player from attempting a given course of action, that player doesn't necessarily have any chance of success, and the consequences of trying could be very, very bad.

Examples of "You can certainly try"

• Playing a Dragon or any kind of half-Dragon pre-4e D&D.
• Playing a monster in a setting not set up for it.
• Using a lasgun on a defensive shield.