My worst adventure was trying to get from our office in La Defense to the Eurostar at Gare du Nord via metro/RER...at rush hour...with a suitcase wider than the entry turnstyles in the metro station...with my boss, who is claustrophobic. Having to change trains twice, and then run the 800m dash to get to the actual Eurostar boarding, then upstairs, then down the ramps...phew!
Next time we'll take a taxi, even if it is rush hour.