Coins in the can.

Effect - 5 coins disappear and reappear inside a can
which they would not normally fit through the rim of.

Method - Before the performance, take five small
coins and drop them into an empty drink can. Leave
this on the table upright without knocking it or
touching it.

Put a shell stack on the table, visible, and an
unloaded cap.
Carefully place the stack on top of the drink can,
showing that they could not fall through the hole.
Place the unloaded cap over the stack and use the
vanishing move, but without revealing the vanish yet.
Lift the can without shaking the coins inside, and
pretend to press on the cap quite hard. After a few
seconds, jolt the can so the coins inside rattle around.
Reveal the vanish, then get away before they ask to
examine your props.