Playing pocket 2s and As.
Depending on the position you're in and the flop, pocket deuces can break pocket aces, but that's highly unlikely. I've had lower pairs break my pocket aces on the flop and post-flop, which isn't fun, but does happen. Even with aces, it's easily breakable if the villain flops bottom set.
With aces, I usually bet pretty big pre-flop and I'm comfortable raising all-in. With pocket deuces, I will usually bet pretty big in position and fold if it escalates to all-in.