In a complex airspace as the Belgian east sectors, things sometimes get even more complicated by the fact that Flemish and French speaking controllers are working together...
Situation:
Three French speaking controllers (trainee, instructor and planning) at the sector, trainee is holding the mike. Flight ANE8283 comes up on the radar, and since we don't see those very often, he asks the planning controller if he knows the callsign. Planning controller, helpful as he is, sais: 'oh, that's "EZEL"' (since ANE is French for donkey, and donkey in Flemish is EZEL).
On first contact, the trainee replies with: 'EZEL 8283, radar contact!'
It only took him a few extra seconds to realize his mistake...