Thanks a lot for sharing this! I also needed a return flight from Europe this summer and this was perfect. Looks like similar fares can be found for most of eastern/southern Caribbean. The cheapest I saw with a stopover both ways in YYZ was FRA-YYZ-CUR at only C$1800 roundtrip! I only looked for AC direct flights from YYZ to AUA, POS, BGI, UVF, etc, but probably more destinations and combinations are available to be discovered.