Suspension of disbelief is one thing, but with haunted house illusions from the collection at The Horror Dome, your guests will truly believe they've witnessed acts that betray the laws of physics and nature.
When your audience is in the Halloween spirit, they will love to be entertained by these sure-fire magic effects.
In ancient days, the use of magic had a lot of fear associated with it because people didn't really understand it.
Tell them to memorize the date, keep it in their mind, think of a historical event that happened that year, whatever you can to get them to keep the coin in their hands for as long as possible before placing it back on the table in the exact same spot.