As far as I am aware, they are not my actual tax dollars, but as our government is one of the U.S.'s closest allies, my tax dollars do inadvertently end up supporting U.S. endeavours, whether I agree with them or not. The video and further commentary can also be found here.
George Galloway, a U.K. member of parliament who spear-headed the Viva Palestina aid convoy to Gaza, was denied access to Canada after some vigorous lobbying by special interest groups. The video above parodies the situation. The wrong George got let in.
On another issue (but related):Here, Galloway responds to the outrageous actions undertaken by the British Charity Commission against Viva Palestina.