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code/entities/BalloonEntity.cs

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+using Sandbox;
+
+[Library( "ent_balloon", Title = "Balloon", Spawnable = true )]
+public partial class BalloonEntity : Prop
+{
+	private static float GravityScale => -0.2f;
+
+	public override void Spawn()
+	{
+		base.Spawn();
+
+		SetModel( "models/citizen_props/balloonregular01.vmdl" );
+		SetupPhysicsFromModel( PhysicsMotionType.Dynamic, false );
+		PhysicsBody.GravityScale = GravityScale;
+		RenderColor = Color.Random.ToColor32();
+	}
+
+	public override void OnKilled()
+	{
+		base.OnKilled();
+
+		PlaySound( "balloon_pop_cute" );
+	}
+
+	[Event.Physics.PostStep]
+	public void OnPostPhysicsStep()
+	{
+		if ( !this.IsValid() )
+			return;
+
+		var body = PhysicsBody;
+		if ( !body.IsValid() )
+			return;
+
+		body.GravityScale = GravityScale;
+	}
+}