doubleofive said:
I ordered Mrs 5 and I's tickets to Thor in 3D (separately so we each could get $5 off).

I'm only going to tell you this once, because I don't really want to be the grammar guy all of the time...

But you can use the same "remove the other person, how would I say it trick" with possessives just like other pronouns.

I ordered Mrs 5's ticket...

I ordered my ticket...

Therefore: I ordered Mrs 5's and my tickets...

This is apparently one of the most difficult constructs in the English language because even relatively well educated speakers don't quite know how to handle it.

/end*