I know your point was in good humour GT but you do raise a point about tactical voting!
As previously mentioned in a post: vote Lib Dem to keep Tories out, Lib Dems stayed in power for 18 years ,keeping your chosen party out, Irony or what!
Vote Tory to keep UKIP out, Tories and UKIP do a supply and confidence deal, your vote would have been a waste of time if you were a green, NHA, LibDem, Labour voter and I would hazard a guess would make you angry with yourself for ever giving tactical voting a thought let alone doing it.
Likewise in a safe Labour seat vote Lib Dem to keep Labour out, they then go into coalition, why do it? It doesn't assure you of anything other than your party failing and you have aided and abetted the worst outcome possible for yourself.
What if all those who elected to vote tactically had stuck to their principles and voted for their candidate? You may have lost, that's democracy but the next time round you could be in a marginal seat with all to play for!