Wack

Abjuration Cantrip (Bard, Cleric, Druid, Paladin, Ranger, Sorcerer, Warlock, Wizard)
Casting Time: 1 bonus action
Range: 60 feet
Components: VS
Duration: Instantaneous

You choose a creature in range. You do not have to be able to see, but you must know they are there. A small toy mallet appears above their head and smacks them with a bonk or wack. the creature takes one point of force damage.
Roll on the wild magic surge table, the surge you roll takes effect immediately. You may have the effect affect you or the target creature. If the effect requires another spell or action to be cast, wack gets cast immediately again and its damage is replaced with 1d6 Force damage.
When you reach certain levels this spell becomes more potent: at 5th level, you roll an additional time on the wild magic surge table, 11th (3 times), 17th (4 times)