Linear interpolation is boring...

Interpolation.cs

using System.Runtime.CompilerServices;
using UnityEngine;

/// <summary>
/// Convert linear 0.0f - 1.0f values to some other non-linear value.
/// </summary>
public static class Interpolation
{
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float Boing(float v) => (Mathf.Sin(v * Mathf.PI * (0.2f + 2.5f * v * v * v)) * Mathf.Pow(1f - v, 2.2f) + v) * (1f + (1.2f * (1f - v)));

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float Sine(float v) => Mathf.Sin(v * Mathf.PI * 0.5f);

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float Cosine(float v) => (1.0f - Mathf.Cos(v * Mathf.PI * 0.5f));

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float Cubic(float v) => v * v * (3.0f - 2.0f * v);

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float Bounce(float v) => 1f - Mathf.Abs(Mathf.Sin((Mathf.PI * 1.5f) * (v + 1f) * (v + 1f)) * (1f - v));

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float Quintic(float v) => 6 * (v * v * v * v * v) - 15 * (v * v * v * v) + 10 * (v * v * v);
}