'No' to the pocket urinal.

Occasionally I end up in a middle/window seat. I'm going to have to get up during the flight; if it's a long flight, I'm going to get up multiple times. If it's a flight where we're likely to have sleep time, I let my seatmate know and ask what s/he prefers: me climbing over or waking him/her up.

On a recent FRA-ORD flight, I was in a middle seat. While we were still taxi-ing, my aisle seatmate said he'd be popping an ambien, planned on being comatose most of the flight and told me that if I needed to get out, feel free to climb over him, don't bother trying to wake him up. I really appreciated that.

Big4Flyer, I sympathize with you (long waits on the tarmac when you can't leave your seat can be beastly).

Re: tight space in coach. It's no picnic for middle/window seat pax in business/first either, and it's a lot more hassle if you have to wake a reclined sleeper up to get out.