This reminds me when I told about my dads colleage, a middle aged college lecturer with an EK9 Civic Type-R. HE left his car with a main dealer for the usual service and MOT and they needed to keep it till the next day for whatever reason. Whilst walking from pub to pub early on a night out, his car blaseted past him bouncing off the rev limiter.
I think he ended up being compensated quite well, but from that I wouldn't be leaving my car overnight with a garage if I can avoid it, however the people I use at present are very trustworthy and have nicer cars than myself.