Here's a great quick tip for crazy delays, championed by the crazy French producer Sebastien Leger, You can hear these crazy re-pitched delays in such tracks as his remix of Format: B - Dog Tags - Click here to listen
1. All you need to do is drop Ableton's ping pong delay onto a send.
2. Set it to 100% wet and a reasonable amount of feedback (75% or more)
3. Right click on the title of the effect and select re-pitch Click the Sync button so it changes to Time.
4. Turn up the send on a track so there's some audio coming through, then change the delay time. You could even set up a midi controller for live crazy delay effects.