I loathe you Property

So here's a question that has popped up 3 times already during my property drills today. What happens when A conveys to B, then 2 years later asks B to give the deed back. B gives deed back to A, A destroys it. Who owns now? Apparently B still owns it, but in equity, that just doesn't make sense.

Here's another one: A leases to B for a period of 5 years. At the end of the 5 years, A writes to B "if you'd like to renew your lease, rent will now be increased to $1200 per month, not $1000". B doesn't respond, but holds over, and sends a check for $1000 with letter stating "$1200 is too much for this craphole". A cashes the check. What is the nature of the tenancy. Apparently, it is a year to year tenancy held at $1200 per month. Even though principles of contract law tell me that the check for $1000 was a counteroffer and cashing the check was an acceptance...wtf? Also, seriously, B is going to be held to another year to year? I would think it would be month-to-month, since the monthly payments impliedly create a month-to-month tenancy...whatever...where's my bottle of wine?