Singing and playing guitar - I can strum or fingerpick while singing (in my normal out-of-tune manner!), but hand me a bass and I totally screw up, singing and playing.
Drums - it depends on how closely the 'beat' matches your own heartbeat. A drum beating at 60 beats per minute or slower is the same speed (or slower) than your heartbeat, and is solemn. 120 and up is twice (or more) your heartbeat, and is 'stirring'. (Marches - apart from pipe bands - are played at 120 bpm, which is also a good walking speed, surprisingly enough. Most of the newer dance stuff is 140 bpm.) 60-120 is no-man's-land, where it depends on major/minor keys, melody, etc.
Foreign music tends to sound strange when it uses chord structures, melodic patterns or harmonies that you're not used to. Modern jazz is just strange.
As for what I find strange - people who wake up in the morning - none of this 'what day is it? what year is it? what planet is it? where's the damned snooze button? *snore*' stuff.
People (usually women) who are that desperate to get the dishes washed, they're hovering over you as you try to eat the last few mouthfulls - 'You finished with that plate yet?'
People who stand, 2 or 3 abreast, behind you in shop queues, and, as soon as you're served, they all try to step forward, and it's your fault for blocking their access.
People.
Alcohol. Why do we do it? We all know we'll end up talking too loud, laughing at nothing, making utter pillocks of ourselves, and we keep pouring the stuff down.
Bus timetabling. The company that I worked for, temporarily, sent a Mini out mid-morning to find out how long it took to get from A to B (rumour has it they now do it at 3 a.m.) They took no account of speed limits, traffic, time spent picking up/dropping off passengers, collecting fares - and with my Head Office privilege ticket, I used to get hell. And the other local bus company seems to think that the 'outer circle' (i.e. right round Edinburgh) takes the same length of time between 8 and 10 in the morning as between 8 and 10 at night.
Chapter 2.
The School Run. - sorry, that's people again.
Soaps - Corrie, Eastenders, etc. - sorry, people again.
"A'body's strange but thee and me, and I'm worried about thee...."