[doctorsexy]

A penguin goes into a small independent one-man-band garage and says to the guy I think I've got an oil leak at one of my driveshafts on the gearbox. No problem says the guy but it'll be about half-an-hour before I can get it up on the ramp. That's fine I'll take a dander up the High Street and do a few errands - I'll call back in 30 minutes or so.
As the penguin wanders up the street he notices an ice cream parlour (we all know penguins just love ice cream). He tries to resist as having no fingers he usually nakes a mess of his chin but the urge is too strong and in he goes for a knickerbocker glory. Slurps it all up and no doubt his beak and chin are a mess of white cream.
Evetually he walks back into the garge to find the mechanic peering up into the bottom of his engine. What's up said the penguin?

Looks like you've blown a seal says the mechanic.

No, no honestly says the penguin it's ice cream.