sounds

Cellphone rings:
http://www.soundsnap.com/node/14087
http://www.soundsnap.com/node/25183
http://www.soundsnap.com/node/24992
http://www.soundsnap.com/node/79487<---I like this one best
http://www.soundsnap.com/node/81185
http://www.soundsnap.com/node/79403

For chair "thud" (the one in the theatre i suppose):
http://www.soundsnap.com/node/19247
http://www.soundsnap.com/node/48568
http://www.soundsnap.com/node/63715
http://www.soundsnap.com/node/41874 <--- this one sounds perfect to me!