1. Spawn a chair of your choice.
2. Freeze it where you choose to escape.
3. No Collide Everything.
4. Tap it with your Physgun and quickly press "E" to hop on and catch your ride out!

If your reflexes are a tad too slow, you can weld it after doing the No-Collide, then tap to unfreeze and update its physics. This way you can hop on more comfortably and press your "undo" key whenever you're ready!


Credits to Nick for teaching me this.